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39 | package AnyEvent::HTTP; |
39 | package AnyEvent::HTTP; |
40 | |
40 | |
41 | use strict; |
41 | use strict; |
42 | no warnings; |
42 | no warnings; |
43 | |
43 | |
44 | use Carp; |
44 | use Errno (); |
45 | |
45 | |
46 | use AnyEvent (); |
46 | use AnyEvent 5.0 (); |
47 | use AnyEvent::Util (); |
47 | use AnyEvent::Util (); |
48 | use AnyEvent::Socket (); |
48 | use AnyEvent::Socket (); |
49 | use AnyEvent::Handle (); |
49 | use AnyEvent::Handle (); |
50 | |
50 | |
51 | use base Exporter::; |
51 | use base Exporter::; |
52 | |
52 | |
53 | our $VERSION = '1.05'; |
53 | our $VERSION = '1.46'; |
54 | |
54 | |
55 | our @EXPORT = qw(http_get http_post http_head http_request); |
55 | our @EXPORT = qw(http_get http_post http_head http_request); |
56 | |
56 | |
57 | our $USERAGENT = "Mozilla/5.0 (compatible; AnyEvent::HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)"; |
57 | our $USERAGENT = "Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)"; |
58 | our $MAX_RECURSE = 10; |
58 | our $MAX_RECURSE = 10; |
59 | our $MAX_PERSISTENT = 8; |
59 | our $MAX_PERSISTENT = 8; |
60 | our $PERSISTENT_TIMEOUT = 2; |
60 | our $PERSISTENT_TIMEOUT = 2; |
61 | our $TIMEOUT = 300; |
61 | our $TIMEOUT = 300; |
62 | |
62 | |
63 | # changing these is evil |
63 | # changing these is evil |
64 | our $MAX_PERSISTENT_PER_HOST = 2; |
64 | our $MAX_PERSISTENT_PER_HOST = 0; |
65 | our $MAX_PER_HOST = 4; |
65 | our $MAX_PER_HOST = 4; |
66 | |
66 | |
67 | our $PROXY; |
67 | our $PROXY; |
68 | our $ACTIVE = 0; |
68 | our $ACTIVE = 0; |
69 | |
69 | |
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92 | must be an absolute http or https URL. |
92 | must be an absolute http or https URL. |
93 | |
93 | |
94 | When called in void context, nothing is returned. In other contexts, |
94 | When called in void context, nothing is returned. In other contexts, |
95 | C<http_request> returns a "cancellation guard" - you have to keep the |
95 | C<http_request> returns a "cancellation guard" - you have to keep the |
96 | object at least alive until the callback get called. If the object gets |
96 | object at least alive until the callback get called. If the object gets |
97 | destroyed before the callbakc is called, the request will be cancelled. |
97 | destroyed before the callback is called, the request will be cancelled. |
98 | |
98 | |
99 | The callback will be called with the response data as first argument |
99 | The callback will be called with the response body data as first argument |
100 | (or C<undef> if it wasn't available due to errors), and a hash-ref with |
100 | (or C<undef> if an error occured), and a hash-ref with response headers as |
101 | response headers as second argument. |
101 | second argument. |
102 | |
102 | |
103 | All the headers in that hash are lowercased. In addition to the response |
103 | All the headers in that hash are lowercased. In addition to the response |
104 | headers, the "pseudo-headers" C<HTTPVersion>, C<Status> and C<Reason> |
104 | headers, the "pseudo-headers" (uppercase to avoid clashing with possible |
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105 | response headers) C<HTTPVersion>, C<Status> and C<Reason> contain the |
105 | contain the three parts of the HTTP Status-Line of the same name. The |
106 | three parts of the HTTP Status-Line of the same name. |
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107 | |
106 | pseudo-header C<URL> contains the original URL (which can differ from the |
108 | The pseudo-header C<URL> contains the actual URL (which can differ from |
107 | requested URL when following redirects). |
109 | the requested URL when following redirects - for example, you might get |
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110 | an error that your URL scheme is not supported even though your URL is a |
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111 | valid http URL because it redirected to an ftp URL, in which case you can |
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112 | look at the URL pseudo header). |
108 | |
113 | |
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114 | The pseudo-header C<Redirect> only exists when the request was a result |
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115 | of an internal redirect. In that case it is an array reference with |
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116 | the C<($data, $headers)> from the redirect response. Note that this |
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117 | response could in turn be the result of a redirect itself, and C<< |
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118 | $headers->{Redirect}[1]{Redirect} >> will then contain the original |
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119 | response, and so on. |
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120 | |
109 | If the server sends a header multiple lines, then their contents will be |
121 | If the server sends a header multiple times, then their contents will be |
110 | joined together with a command (C<,>). |
122 | joined together with a comma (C<,>), as per the HTTP spec. |
111 | |
123 | |
112 | If an internal error occurs, such as not being able to resolve a hostname, |
124 | If an internal error occurs, such as not being able to resolve a hostname, |
113 | then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<599> |
125 | then C<$data> will be C<undef>, C<< $headers->{Status} >> will be C<59x> |
114 | and the C<Reason> pseudo-header will contain an error message. |
126 | (usually C<599>) and the C<Reason> pseudo-header will contain an error |
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127 | message. |
115 | |
128 | |
116 | A typical callback might look like this: |
129 | A typical callback might look like this: |
117 | |
130 | |
118 | sub { |
131 | sub { |
119 | my ($body, $hdr) = @_; |
132 | my ($body, $hdr) = @_; |
… | |
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137 | |
150 | |
138 | =item headers => hashref |
151 | =item headers => hashref |
139 | |
152 | |
140 | The request headers to use. Currently, C<http_request> may provide its |
153 | The request headers to use. Currently, C<http_request> may provide its |
141 | own C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers |
154 | own C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers |
142 | and will provide defaults for C<User-Agent:> and C<Referer:>. |
155 | and will provide defaults for C<User-Agent:> and C<Referer:> (this can be |
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156 | suppressed by using C<undef> for these headers in which case they won't be |
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157 | sent at all). |
143 | |
158 | |
144 | =item timeout => $seconds |
159 | =item timeout => $seconds |
145 | |
160 | |
146 | The time-out to use for various stages - each connect attempt will reset |
161 | The time-out to use for various stages - each connect attempt will reset |
147 | the timeout, as will read or write activity. Default timeout is 5 minutes. |
162 | the timeout, as will read or write activity, i.e. this is not an overall |
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163 | timeout. |
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164 | |
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165 | Default timeout is 5 minutes. |
148 | |
166 | |
149 | =item proxy => [$host, $port[, $scheme]] or undef |
167 | =item proxy => [$host, $port[, $scheme]] or undef |
150 | |
168 | |
151 | Use the given http proxy for all requests. If not specified, then the |
169 | Use the given http proxy for all requests. If not specified, then the |
152 | default proxy (as specified by C<$ENV{http_proxy}>) is used. |
170 | default proxy (as specified by C<$ENV{http_proxy}>) is used. |
153 | |
171 | |
154 | C<$scheme> must be either missing or C<http> for HTTP, or C<https> for |
172 | C<$scheme> must be either missing, C<http> for HTTP or C<https> for |
155 | HTTPS. |
173 | HTTPS. |
156 | |
174 | |
157 | =item body => $string |
175 | =item body => $string |
158 | |
176 | |
159 | The request body, usually empty. Will be-sent as-is (future versions of |
177 | The request body, usually empty. Will be-sent as-is (future versions of |
… | |
… | |
165 | based on the original netscape specification. |
183 | based on the original netscape specification. |
166 | |
184 | |
167 | The C<$hash_ref> must be an (initially empty) hash reference which will |
185 | The C<$hash_ref> must be an (initially empty) hash reference which will |
168 | get updated automatically. It is possible to save the cookie_jar to |
186 | get updated automatically. It is possible to save the cookie_jar to |
169 | persistent storage with something like JSON or Storable, but this is not |
187 | persistent storage with something like JSON or Storable, but this is not |
170 | recommended, as expire times are currently being ignored. |
188 | recommended, as expiry times are currently being ignored. |
171 | |
189 | |
172 | Note that this cookie implementation is not of very high quality, nor |
190 | Note that this cookie implementation is not of very high quality, nor |
173 | meant to be complete. If you want complete cookie management you have to |
191 | meant to be complete. If you want complete cookie management you have to |
174 | do that on your own. C<cookie_jar> is meant as a quick fix to get some |
192 | do that on your own. C<cookie_jar> is meant as a quick fix to get some |
175 | cookie-using sites working. Cookies are a privacy disaster, do not use |
193 | cookie-using sites working. Cookies are a privacy disaster, do not use |
176 | them unless required to. |
194 | them unless required to. |
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195 | |
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196 | =item tls_ctx => $scheme | $tls_ctx |
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197 | |
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198 | Specifies the AnyEvent::TLS context to be used for https connections. This |
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199 | parameter follows the same rules as the C<tls_ctx> parameter to |
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200 | L<AnyEvent::Handle>, but additionally, the two strings C<low> or |
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201 | C<high> can be specified, which give you a predefined low-security (no |
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202 | verification, highest compatibility) and high-security (CA and common-name |
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203 | verification) TLS context. |
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204 | |
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205 | The default for this option is C<low>, which could be interpreted as "give |
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206 | me the page, no matter what". |
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207 | |
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208 | =item on_prepare => $callback->($fh) |
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209 | |
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210 | In rare cases you need to "tune" the socket before it is used to |
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211 | connect (for exmaple, to bind it on a given IP address). This parameter |
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212 | overrides the prepare callback passed to C<AnyEvent::Socket::tcp_connect> |
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213 | and behaves exactly the same way (e.g. it has to provide a |
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214 | timeout). See the description for the C<$prepare_cb> argument of |
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215 | C<AnyEvent::Socket::tcp_connect> for details. |
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216 | |
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217 | =item on_header => $callback->($headers) |
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218 | |
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219 | When specified, this callback will be called with the header hash as soon |
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220 | as headers have been successfully received from the remote server (not on |
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221 | locally-generated errors). |
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222 | |
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223 | It has to return either true (in which case AnyEvent::HTTP will continue), |
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224 | or false, in which case AnyEvent::HTTP will cancel the download (and call |
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225 | the finish callback with an error code of C<598>). |
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226 | |
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227 | This callback is useful, among other things, to quickly reject unwanted |
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228 | content, which, if it is supposed to be rare, can be faster than first |
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229 | doing a C<HEAD> request. |
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230 | |
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231 | Example: cancel the request unless the content-type is "text/html". |
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232 | |
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233 | on_header => sub { |
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234 | $_[0]{"content-type"} =~ /^text\/html\s*(?:;|$)/ |
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235 | }, |
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236 | |
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237 | =item on_body => $callback->($partial_body, $headers) |
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238 | |
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239 | When specified, all body data will be passed to this callback instead of |
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240 | to the completion callback. The completion callback will get the empty |
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241 | string instead of the body data. |
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242 | |
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243 | It has to return either true (in which case AnyEvent::HTTP will continue), |
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244 | or false, in which case AnyEvent::HTTP will cancel the download (and call |
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245 | the completion callback with an error code of C<598>). |
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246 | |
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247 | This callback is useful when the data is too large to be held in memory |
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248 | (so the callback writes it to a file) or when only some information should |
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249 | be extracted, or when the body should be processed incrementally. |
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250 | |
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251 | It is usually preferred over doing your own body handling via |
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252 | C<want_body_handle>, but in case of streaming APIs, where HTTP is |
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253 | only used to create a connection, C<want_body_handle> is the better |
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254 | alternative, as it allows you to install your own event handler, reducing |
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255 | resource usage. |
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256 | |
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257 | =item want_body_handle => $enable |
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258 | |
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259 | When enabled (default is disabled), the behaviour of AnyEvent::HTTP |
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260 | changes considerably: after parsing the headers, and instead of |
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261 | downloading the body (if any), the completion callback will be |
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262 | called. Instead of the C<$body> argument containing the body data, the |
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263 | callback will receive the L<AnyEvent::Handle> object associated with the |
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264 | connection. In error cases, C<undef> will be passed. When there is no body |
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265 | (e.g. status C<304>), the empty string will be passed. |
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266 | |
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267 | The handle object might or might not be in TLS mode, might be connected to |
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268 | a proxy, be a persistent connection etc., and configured in unspecified |
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269 | ways. The user is responsible for this handle (it will not be used by this |
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270 | module anymore). |
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271 | |
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272 | This is useful with some push-type services, where, after the initial |
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273 | headers, an interactive protocol is used (typical example would be the |
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274 | push-style twitter API which starts a JSON/XML stream). |
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275 | |
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276 | If you think you need this, first have a look at C<on_body>, to see if |
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277 | that doesn't solve your problem in a better way. |
177 | |
278 | |
178 | =back |
279 | =back |
179 | |
280 | |
180 | Example: make a simple HTTP GET request for http://www.nethype.de/ |
281 | Example: make a simple HTTP GET request for http://www.nethype.de/ |
181 | |
282 | |
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237 | push @{ $CO_SLOT{$_[0]}[1] }, $_[1]; |
338 | push @{ $CO_SLOT{$_[0]}[1] }, $_[1]; |
238 | |
339 | |
239 | _slot_schedule $_[0]; |
340 | _slot_schedule $_[0]; |
240 | } |
341 | } |
241 | |
342 | |
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343 | our $qr_nlnl = qr{(?<![^\012])\015?\012}; |
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344 | |
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345 | our $TLS_CTX_LOW = { cache => 1, sslv2 => 1 }; |
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346 | our $TLS_CTX_HIGH = { cache => 1, verify => 1, verify_peername => "https" }; |
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347 | |
242 | sub http_request($$@) { |
348 | sub http_request($$@) { |
243 | my $cb = pop; |
349 | my $cb = pop; |
244 | my ($method, $url, %arg) = @_; |
350 | my ($method, $url, %arg) = @_; |
245 | |
351 | |
246 | my %hdr; |
352 | my %hdr; |
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353 | |
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354 | $arg{tls_ctx} = $TLS_CTX_LOW if $arg{tls_ctx} eq "low" || !exists $arg{tls_ctx}; |
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355 | $arg{tls_ctx} = $TLS_CTX_HIGH if $arg{tls_ctx} eq "high"; |
247 | |
356 | |
248 | $method = uc $method; |
357 | $method = uc $method; |
249 | |
358 | |
250 | if (my $hdr = $arg{headers}) { |
359 | if (my $hdr = $arg{headers}) { |
251 | while (my ($k, $v) = each %$hdr) { |
360 | while (my ($k, $v) = each %$hdr) { |
252 | $hdr{lc $k} = $v; |
361 | $hdr{lc $k} = $v; |
253 | } |
362 | } |
254 | } |
363 | } |
255 | |
364 | |
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365 | # pseudo headers for all subsequent responses |
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366 | my @pseudo = (URL => $url); |
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367 | push @pseudo, Redirect => delete $arg{Redirect} if exists $arg{Redirect}; |
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368 | |
256 | my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE; |
369 | my $recurse = exists $arg{recurse} ? delete $arg{recurse} : $MAX_RECURSE; |
257 | |
370 | |
258 | return $cb->(undef, { Status => 599, Reason => "recursion limit reached", URL => $url }) |
371 | return $cb->(undef, { Status => 599, Reason => "Too many redirections", @pseudo }) |
259 | if $recurse < 0; |
372 | if $recurse < 0; |
260 | |
373 | |
261 | my $proxy = $arg{proxy} || $PROXY; |
374 | my $proxy = $arg{proxy} || $PROXY; |
262 | my $timeout = $arg{timeout} || $TIMEOUT; |
375 | my $timeout = $arg{timeout} || $TIMEOUT; |
263 | |
376 | |
264 | $hdr{"user-agent"} ||= $USERAGENT; |
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265 | |
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266 | my ($uscheme, $uauthority, $upath, $query, $fragment) = |
377 | my ($uscheme, $uauthority, $upath, $query, $fragment) = |
267 | $url =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\?([^#]*))?(?:#(.*))?|; |
378 | $url =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:(\?[^#]*))?(?:#(.*))?|; |
268 | |
379 | |
269 | $uscheme = lc $uscheme; |
380 | $uscheme = lc $uscheme; |
270 | |
381 | |
271 | my $uport = $uscheme eq "http" ? 80 |
382 | my $uport = $uscheme eq "http" ? 80 |
272 | : $uscheme eq "https" ? 443 |
383 | : $uscheme eq "https" ? 443 |
273 | : return $cb->(undef, { Status => 599, Reason => "only http and https URL schemes supported", URL => $url }); |
384 | : return $cb->(undef, { Status => 599, Reason => "Only http and https URL schemes supported", @pseudo }); |
274 | |
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275 | $hdr{referer} ||= "$uscheme://$uauthority$upath"; # leave out fragment and query string, just a heuristic |
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276 | |
385 | |
277 | $uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x |
386 | $uauthority =~ /^(?: .*\@ )? ([^\@:]+) (?: : (\d+) )?$/x |
278 | or return $cb->(undef, { Status => 599, Reason => "unparsable URL", URL => $url }); |
387 | or return $cb->(undef, { Status => 599, Reason => "Unparsable URL", @pseudo }); |
279 | |
388 | |
280 | my $uhost = $1; |
389 | my $uhost = $1; |
281 | $uport = $2 if defined $2; |
390 | $uport = $2 if defined $2; |
282 | |
391 | |
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392 | $hdr{host} = defined $2 ? "$uhost:$2" : "$uhost" |
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393 | unless exists $hdr{host}; |
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394 | |
283 | $uhost =~ s/^\[(.*)\]$/$1/; |
395 | $uhost =~ s/^\[(.*)\]$/$1/; |
284 | $upath .= "?$query" if length $query; |
396 | $upath .= $query if length $query; |
285 | |
397 | |
286 | $upath =~ s%^/?%/%; |
398 | $upath =~ s%^/?%/%; |
287 | |
399 | |
288 | # cookie processing |
400 | # cookie processing |
289 | if (my $jar = $arg{cookie_jar}) { |
401 | if (my $jar = $arg{cookie_jar}) { |
… | |
… | |
317 | } |
429 | } |
318 | |
430 | |
319 | my ($rhost, $rport, $rscheme, $rpath); # request host, port, path |
431 | my ($rhost, $rport, $rscheme, $rpath); # request host, port, path |
320 | |
432 | |
321 | if ($proxy) { |
433 | if ($proxy) { |
322 | ($rhost, $rport, $rscheme, $rpath) = (@$proxy, $url); |
434 | ($rpath, $rhost, $rport, $rscheme) = ($url, @$proxy); |
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435 | |
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436 | $rscheme = "http" unless defined $rscheme; |
323 | |
437 | |
324 | # don't support https requests over https-proxy transport, |
438 | # don't support https requests over https-proxy transport, |
325 | # can't be done with tls as spec'ed. |
439 | # can't be done with tls as spec'ed, unless you double-encrypt. |
326 | $rscheme = "http" if $uscheme eq "https" && $rscheme eq "https"; |
440 | $rscheme = "http" if $uscheme eq "https" && $rscheme eq "https"; |
327 | } else { |
441 | } else { |
328 | ($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath); |
442 | ($rhost, $rport, $rscheme, $rpath) = ($uhost, $uport, $uscheme, $upath); |
329 | } |
443 | } |
330 | |
444 | |
331 | $hdr{host} = $uhost; |
445 | # leave out fragment and query string, just a heuristic |
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446 | $hdr{referer} ||= "$uscheme://$uauthority$upath" unless exists $hdr{referer}; |
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447 | $hdr{"user-agent"} ||= $USERAGENT unless exists $hdr{"user-agent"}; |
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448 | |
332 | $hdr{"content-length"} = length $arg{body}; |
449 | $hdr{"content-length"} = length $arg{body} |
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450 | if length $arg{body} || $method ne "GET"; |
333 | |
451 | |
334 | my %state = (connect_guard => 1); |
452 | my %state = (connect_guard => 1); |
335 | |
453 | |
336 | _get_slot $uhost, sub { |
454 | _get_slot $uhost, sub { |
337 | $state{slot_guard} = shift; |
455 | $state{slot_guard} = shift; |
338 | |
456 | |
339 | return unless $state{connect_guard}; |
457 | return unless $state{connect_guard}; |
340 | |
458 | |
341 | $state{connect_guard} = AnyEvent::Socket::tcp_connect $rhost, $rport, sub { |
459 | $state{connect_guard} = AnyEvent::Socket::tcp_connect $rhost, $rport, sub { |
342 | $state{fh} = shift |
460 | $state{fh} = shift |
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461 | or do { |
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462 | my $err = "$!"; |
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463 | %state = (); |
343 | or return $cb->(undef, { Status => 599, Reason => "$!", URL => $url }); |
464 | return $cb->(undef, { Status => 599, Reason => $err, @pseudo }); |
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465 | }; |
344 | |
466 | |
345 | delete $state{connect_guard}; # reduce memory usage, save a tree |
467 | pop; # free memory, save a tree |
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468 | |
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469 | return unless delete $state{connect_guard}; |
346 | |
470 | |
347 | # get handle |
471 | # get handle |
348 | $state{handle} = new AnyEvent::Handle |
472 | $state{handle} = new AnyEvent::Handle |
349 | fh => $state{fh}; |
473 | fh => $state{fh}, |
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474 | peername => $rhost, |
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475 | tls_ctx => $arg{tls_ctx}, |
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476 | # these need to be reconfigured on keepalive handles |
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477 | timeout => $timeout, |
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478 | on_error => sub { |
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479 | %state = (); |
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480 | $cb->(undef, { Status => 599, Reason => $_[2], @pseudo }); |
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481 | }, |
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482 | on_eof => sub { |
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483 | %state = (); |
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484 | $cb->(undef, { Status => 599, Reason => "Unexpected end-of-file", @pseudo }); |
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485 | }, |
|
|
486 | ; |
350 | |
487 | |
351 | # limit the number of persistent connections |
488 | # limit the number of persistent connections |
|
|
489 | # keepalive not yet supported |
352 | if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) { |
490 | # if ($KA_COUNT{$_[1]} < $MAX_PERSISTENT_PER_HOST) { |
353 | ++$KA_COUNT{$_[1]}; |
491 | # ++$KA_COUNT{$_[1]}; |
354 | $state{handle}{ka_count_guard} = AnyEvent::Util::guard { --$KA_COUNT{$_[1]} }; |
492 | # $state{handle}{ka_count_guard} = AnyEvent::Util::guard { |
|
|
493 | # --$KA_COUNT{$_[1]} |
|
|
494 | # }; |
355 | $hdr{connection} = "keep-alive"; |
495 | # $hdr{connection} = "keep-alive"; |
356 | delete $hdr{connection}; # keep-alive not yet supported |
|
|
357 | } else { |
496 | # } else { |
358 | delete $hdr{connection}; |
497 | delete $hdr{connection}; |
359 | } |
498 | # } |
360 | |
|
|
361 | # (re-)configure handle |
|
|
362 | $state{handle}->timeout ($timeout); |
|
|
363 | $state{handle}->on_error (sub { |
|
|
364 | my $errno = "$!"; |
|
|
365 | %state = (); |
|
|
366 | $cb->(undef, { Status => 599, Reason => $errno, URL => $url }); |
|
|
367 | }); |
|
|
368 | $state{handle}->on_eof (sub { |
|
|
369 | %state = (); |
|
|
370 | $cb->(undef, { Status => 599, Reason => "unexpected end-of-file", URL => $url }); |
|
|
371 | }); |
|
|
372 | |
499 | |
373 | $state{handle}->starttls ("connect") if $rscheme eq "https"; |
500 | $state{handle}->starttls ("connect") if $rscheme eq "https"; |
374 | |
501 | |
375 | # handle actual, non-tunneled, request |
502 | # handle actual, non-tunneled, request |
376 | my $handle_actual_request = sub { |
503 | my $handle_actual_request = sub { |
377 | # $state{handle}->starttls ("connect") if $uscheme eq "https"; |
504 | $state{handle}->starttls ("connect") if $uscheme eq "https" && !exists $state{handle}{tls}; |
378 | |
505 | |
379 | # send request |
506 | # send request |
380 | $state{handle}->push_write ( |
507 | $state{handle}->push_write ( |
381 | "$method $rpath HTTP/1.0\015\012" |
508 | "$method $rpath HTTP/1.0\015\012" |
382 | . (join "", map "\u$_: $hdr{$_}\015\012", keys %hdr) |
509 | . (join "", map "\u$_: $hdr{$_}\015\012", grep defined $hdr{$_}, keys %hdr) |
383 | . "\015\012" |
510 | . "\015\012" |
384 | . (delete $arg{body}) |
511 | . (delete $arg{body}) |
385 | ); |
512 | ); |
386 | |
513 | |
|
|
514 | # return if error occured during push_write() |
|
|
515 | return unless %state; |
|
|
516 | |
387 | %hdr = (); # reduce memory usage, save a kitten |
517 | %hdr = (); # reduce memory usage, save a kitten, also make it possible to re-use |
388 | |
518 | |
389 | # status line |
519 | # status line and headers |
390 | $state{handle}->push_read (line => qr/\015?\012/, sub { |
520 | $state{handle}->push_read (line => $qr_nlnl, sub { |
391 | $_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix |
|
|
392 | or return (%state = (), $cb->(undef, { Status => 599, Reason => "invalid server response ($_[1])", URL => $url })); |
|
|
393 | |
|
|
394 | my %hdr = ( # response headers |
|
|
395 | HTTPVersion => ",$1", |
|
|
396 | Status => ",$2", |
|
|
397 | Reason => ",$3", |
|
|
398 | URL => ",$url" |
|
|
399 | ); |
|
|
400 | |
|
|
401 | # headers, could be optimized a bit |
|
|
402 | $state{handle}->unshift_read (line => qr/\015?\012\015?\012/, sub { |
|
|
403 | for ("$_[1]\012") { |
521 | for ("$_[1]") { |
404 | y/\015//d; # weed out any \015, as they show up in the weirdest of places. |
522 | y/\015//d; # weed out any \015, as they show up in the weirdest of places. |
405 | |
523 | |
406 | # we support spaces in field names, as lotus domino |
524 | /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )? \015?\012/igxc |
407 | # creates them (actually spaces around seperators |
525 | or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid server response", @pseudo })); |
408 | # are strictly allowed in http, they are a security issue). |
526 | |
|
|
527 | push @pseudo, |
|
|
528 | HTTPVersion => $1, |
|
|
529 | Status => $2, |
|
|
530 | Reason => $3, |
|
|
531 | ; |
|
|
532 | |
|
|
533 | # things seen, not parsed: |
|
|
534 | # p3pP="NON CUR OTPi OUR NOR UNI" |
|
|
535 | |
409 | $hdr{lc $1} .= ",$2" |
536 | $hdr{lc $1} .= ",$2" |
410 | while /\G |
537 | while /\G |
411 | ([^:\000-\037]+): |
538 | ([^:\000-\037]*): |
412 | [\011\040]* |
539 | [\011\040]* |
413 | ((?: [^\012]+ | \012[\011\040] )*) |
540 | ((?: [^\012]+ | \012[\011\040] )*) |
414 | \012 |
541 | \012 |
415 | /gxc; |
542 | /gxc; |
416 | |
543 | |
417 | /\G$/ |
544 | /\G$/ |
418 | or return (%state = (), $cb->(undef, { Status => 599, Reason => "garbled response headers", URL => $url })); |
545 | or return (%state = (), $cb->(undef, { Status => 599, Reason => "Garbled response headers", @pseudo })); |
|
|
546 | } |
|
|
547 | |
|
|
548 | # remove the "," prefix we added to all headers above |
|
|
549 | substr $_, 0, 1, "" |
|
|
550 | for values %hdr; |
|
|
551 | |
|
|
552 | # patch in all pseudo headers |
|
|
553 | %hdr = (%hdr, @pseudo); |
|
|
554 | |
|
|
555 | # redirect handling |
|
|
556 | # microsoft and other shitheads don't give a shit for following standards, |
|
|
557 | # try to support some common forms of broken Location headers. |
|
|
558 | if ($hdr{location} !~ /^(?: $ | [^:\/?\#]+ : )/x) { |
|
|
559 | $hdr{location} =~ s/^\.\/+//; |
|
|
560 | |
|
|
561 | my $url = "$rscheme://$uhost:$uport"; |
|
|
562 | |
|
|
563 | unless ($hdr{location} =~ s/^\///) { |
|
|
564 | $url .= $upath; |
|
|
565 | $url =~ s/\/[^\/]*$//; |
419 | } |
566 | } |
420 | |
567 | |
421 | substr $_, 0, 1, "" |
568 | $hdr{location} = "$url/$hdr{location}"; |
422 | for values %hdr; |
569 | } |
423 | |
570 | |
|
|
571 | my $redirect; |
|
|
572 | |
|
|
573 | if ($recurse) { |
|
|
574 | my $status = $hdr{Status}; |
|
|
575 | |
|
|
576 | # industry standard is to redirect POST as GET for |
|
|
577 | # 301, 302 and 303, in contrast to http/1.0 and 1.1. |
|
|
578 | # also, the UA should ask the user for 301 and 307 and POST, |
|
|
579 | # industry standard seems to be to simply follow. |
|
|
580 | # we go with the industry standard. |
|
|
581 | if ($status == 301 or $status == 302 or $status == 303) { |
|
|
582 | # HTTP/1.1 is unclear on how to mutate the method |
|
|
583 | $method = "GET" unless $method eq "HEAD"; |
|
|
584 | $redirect = 1; |
|
|
585 | } elsif ($status == 307) { |
|
|
586 | $redirect = 1; |
|
|
587 | } |
|
|
588 | } |
|
|
589 | |
424 | my $finish = sub { |
590 | my $finish = sub { |
425 | # TODO: use destroy method, when/if available |
|
|
426 | #$state{handle}->destroy; |
591 | $state{handle}->destroy if $state{handle}; |
427 | $state{handle}->on_eof (undef); |
|
|
428 | $state{handle}->on_error (undef); |
|
|
429 | %state = (); |
592 | %state = (); |
430 | |
593 | |
431 | # set-cookie processing |
594 | # set-cookie processing |
432 | if ($arg{cookie_jar}) { |
595 | if ($arg{cookie_jar}) { |
433 | for ($hdr{"set-cookie"}) { |
596 | for ($_[1]{"set-cookie"}) { |
434 | # parse NAME=VALUE |
597 | # parse NAME=VALUE |
435 | my @kv; |
598 | my @kv; |
436 | |
599 | |
437 | while (/\G\s* ([^=;,[:space:]]+) \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^=;,[:space:]]*) )/gcxs) { |
600 | while (/\G\s* ([^=;,[:space:]]+) \s*=\s* (?: "((?:[^\\"]+|\\.)*)" | ([^=;,[:space:]]*) )/gcxs) { |
438 | my $name = $1; |
601 | my $name = $1; |
439 | my $value = $3; |
602 | my $value = $3; |
440 | |
603 | |
441 | unless ($value) { |
604 | unless ($value) { |
442 | $value = $2; |
605 | $value = $2; |
443 | $value =~ s/\\(.)/$1/gs; |
606 | $value =~ s/\\(.)/$1/gs; |
444 | } |
|
|
445 | |
|
|
446 | push @kv, $name => $value; |
|
|
447 | |
|
|
448 | last unless /\G\s*;/gc; |
|
|
449 | } |
607 | } |
450 | |
608 | |
|
|
609 | push @kv, $name => $value; |
|
|
610 | |
|
|
611 | last unless /\G\s*;/gc; |
|
|
612 | } |
|
|
613 | |
451 | last unless @kv; |
614 | last unless @kv; |
452 | |
615 | |
453 | my $name = shift @kv; |
616 | my $name = shift @kv; |
454 | my %kv = (value => shift @kv, @kv); |
617 | my %kv = (value => shift @kv, @kv); |
455 | |
618 | |
456 | my $cdom; |
619 | my $cdom; |
457 | my $cpath = (delete $kv{path}) || "/"; |
620 | my $cpath = (delete $kv{path}) || "/"; |
458 | |
621 | |
459 | if (exists $kv{domain}) { |
622 | if (exists $kv{domain}) { |
460 | $cdom = delete $kv{domain}; |
623 | $cdom = delete $kv{domain}; |
|
|
624 | |
|
|
625 | $cdom =~ s/^\.?/./; # make sure it starts with a "." |
|
|
626 | |
|
|
627 | next if $cdom =~ /\.$/; |
461 | |
628 | |
462 | $cdom =~ s/^\.?/./; # make sure it starts with a "." |
|
|
463 | |
|
|
464 | next if $cdom =~ /\.$/; |
|
|
465 | |
|
|
466 | # this is not rfc-like and not netscape-like. go figure. |
629 | # this is not rfc-like and not netscape-like. go figure. |
467 | my $ndots = $cdom =~ y/.//; |
630 | my $ndots = $cdom =~ y/.//; |
468 | next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2); |
631 | next if $ndots < ($cdom =~ /\.[^.][^.]\.[^.][^.]$/ ? 3 : 2); |
469 | } else { |
632 | } else { |
470 | $cdom = $uhost; |
633 | $cdom = $uhost; |
471 | } |
|
|
472 | |
|
|
473 | # store it |
|
|
474 | $arg{cookie_jar}{version} = 1; |
|
|
475 | $arg{cookie_jar}{$cdom}{$cpath}{$name} = \%kv; |
|
|
476 | |
|
|
477 | redo if /\G\s*,/gc; |
|
|
478 | } |
634 | } |
|
|
635 | |
|
|
636 | # store it |
|
|
637 | $arg{cookie_jar}{version} = 1; |
|
|
638 | $arg{cookie_jar}{$cdom}{$cpath}{$name} = \%kv; |
|
|
639 | |
|
|
640 | redo if /\G\s*,/gc; |
479 | } |
641 | } |
480 | |
|
|
481 | # microsoft and other shitheads don't give a shit for following standards, |
|
|
482 | # try to support some common forms of broken Location headers. |
|
|
483 | if ($_[1]{location} !~ /^(?: $ | [^:\/?\#]+ : )/x) { |
|
|
484 | $_[1]{location} =~ s/^\.\/+//; |
|
|
485 | |
|
|
486 | my $url = "$rscheme://$uhost:$uport"; |
|
|
487 | |
|
|
488 | unless ($_[1]{location} =~ s/^\///) { |
|
|
489 | $url .= $upath; |
|
|
490 | $url =~ s/\/[^\/]*$//; |
|
|
491 | } |
|
|
492 | |
|
|
493 | $_[1]{location} = "$url/$_[1]{location}"; |
|
|
494 | } |
|
|
495 | |
|
|
496 | if ($_[1]{Status} =~ /^30[12]$/ && $recurse && $method ne "POST") { |
|
|
497 | # apparently, mozilla et al. just change POST to GET here |
|
|
498 | # more research is needed before we do the same |
|
|
499 | http_request ($method, $_[1]{location}, %arg, recurse => $recurse - 1, $cb); |
|
|
500 | } elsif ($_[1]{Status} == 303 && $recurse) { |
|
|
501 | # even http/1.1 is unclear on how to mutate the method |
|
|
502 | $method = "GET" unless $method eq "HEAD"; |
|
|
503 | http_request ($method => $_[1]{location}, %arg, recurse => $recurse - 1, $cb); |
|
|
504 | } elsif ($_[1]{Status} == 307 && $recurse && $method =~ /^(?:GET|HEAD)$/) { |
|
|
505 | http_request ($method => $_[1]{location}, %arg, recurse => $recurse - 1, $cb); |
|
|
506 | } else { |
|
|
507 | $cb->($_[0], $_[1]); |
|
|
508 | } |
|
|
509 | }; |
642 | } |
510 | |
643 | |
511 | if ($hdr{Status} =~ /^(?:1..|204|304)$/ or $method eq "HEAD") { |
644 | if ($redirect && exists $hdr{location}) { |
512 | $finish->(undef, \%hdr); |
645 | # we ignore any errors, as it is very common to receive |
|
|
646 | # Content-Length != 0 but no actual body |
|
|
647 | # we also access %hdr, as $_[1] might be an erro |
|
|
648 | http_request ( |
|
|
649 | $method => $hdr{location}, |
|
|
650 | %arg, |
|
|
651 | recurse => $recurse - 1, |
|
|
652 | Redirect => \@_, |
|
|
653 | $cb); |
513 | } else { |
654 | } else { |
514 | if (exists $hdr{"content-length"}) { |
655 | $cb->($_[0], $_[1]); |
515 | $_[0]->unshift_read (chunk => $hdr{"content-length"}, sub { |
656 | } |
516 | # could cache persistent connection now |
657 | }; |
517 | if ($hdr{connection} =~ /\bkeep-alive\b/i) { |
658 | |
518 | # but we don't, due to misdesigns, this is annoyingly complex |
659 | my $len = $hdr{"content-length"}; |
|
|
660 | |
|
|
661 | if (!$redirect && $arg{on_header} && !$arg{on_header}(\%hdr)) { |
|
|
662 | $finish->(undef, { Status => 598, Reason => "Request cancelled by on_header", @pseudo }); |
|
|
663 | } elsif ( |
|
|
664 | $hdr{Status} =~ /^(?:1..|[23]04)$/ |
|
|
665 | or $method eq "HEAD" |
|
|
666 | or (defined $len && !$len) |
|
|
667 | ) { |
|
|
668 | # no body |
|
|
669 | $finish->("", \%hdr); |
|
|
670 | } else { |
|
|
671 | # body handling, four different code paths |
|
|
672 | # for want_body_handle, on_body (2x), normal (2x) |
|
|
673 | # we might read too much here, but it does not matter yet (no pers. connections) |
|
|
674 | if (!$redirect && $arg{want_body_handle}) { |
|
|
675 | $_[0]->on_eof (undef); |
|
|
676 | $_[0]->on_error (undef); |
|
|
677 | $_[0]->on_read (undef); |
|
|
678 | |
|
|
679 | $finish->(delete $state{handle}, \%hdr); |
|
|
680 | |
|
|
681 | } elsif ($arg{on_body}) { |
|
|
682 | $_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], @pseudo }) }); |
|
|
683 | if ($len) { |
|
|
684 | $_[0]->on_eof (undef); |
|
|
685 | $_[0]->on_read (sub { |
|
|
686 | $len -= length $_[0]{rbuf}; |
|
|
687 | |
|
|
688 | $arg{on_body}(delete $_[0]{rbuf}, \%hdr) |
|
|
689 | or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", @pseudo }); |
|
|
690 | |
519 | }; |
691 | $len > 0 |
520 | |
|
|
521 | $finish->($_[1], \%hdr); |
692 | or $finish->("", \%hdr); |
522 | }); |
693 | }); |
523 | } else { |
694 | } else { |
524 | # too bad, need to read until we get an error or EOF, |
695 | $_[0]->on_eof (sub { |
525 | # no way to detect winged data. |
696 | $finish->("", \%hdr); |
|
|
697 | }); |
|
|
698 | $_[0]->on_read (sub { |
|
|
699 | $arg{on_body}(delete $_[0]{rbuf}, \%hdr) |
|
|
700 | or $finish->(undef, { Status => 598, Reason => "Request cancelled by on_body", @pseudo }); |
|
|
701 | }); |
|
|
702 | } |
|
|
703 | } else { |
|
|
704 | $_[0]->on_eof (undef); |
|
|
705 | |
|
|
706 | if ($len) { |
|
|
707 | $_[0]->on_error (sub { $finish->(undef, { Status => 599, Reason => $_[2], @pseudo }) }); |
|
|
708 | $_[0]->on_read (sub { |
|
|
709 | $finish->((substr delete $_[0]{rbuf}, 0, $len, ""), \%hdr) |
|
|
710 | if $len <= length $_[0]{rbuf}; |
|
|
711 | }); |
|
|
712 | } else { |
526 | $_[0]->on_error (sub { |
713 | $_[0]->on_error (sub { |
|
|
714 | ($! == Errno::EPIPE || !$!) |
527 | $finish->($_[0]{rbuf}, \%hdr); |
715 | ? $finish->(delete $_[0]{rbuf}, \%hdr) |
|
|
716 | : $finish->(undef, { Status => 599, Reason => $_[2], @pseudo }); |
528 | }); |
717 | }); |
529 | $_[0]->on_eof (undef); |
|
|
530 | $_[0]->on_read (sub { }); |
718 | $_[0]->on_read (sub { }); |
531 | } |
719 | } |
532 | } |
720 | } |
533 | }); |
721 | } |
534 | }); |
722 | }); |
535 | }; |
723 | }; |
536 | |
724 | |
537 | # now handle proxy-CONNECT method |
725 | # now handle proxy-CONNECT method |
538 | if ($proxy && $uscheme eq "https") { |
726 | if ($proxy && $uscheme eq "https") { |
539 | # oh dear, we have to wrap it into a connect request |
727 | # oh dear, we have to wrap it into a connect request |
540 | |
728 | |
541 | # maybe re-use $uauthority with patched port? |
729 | # maybe re-use $uauthority with patched port? |
542 | $state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012"); |
730 | $state{handle}->push_write ("CONNECT $uhost:$uport HTTP/1.0\015\012Host: $uhost\015\012\015\012"); |
543 | $state{handle}->push_read (line => qr/\015?\012\015?\012/, sub { |
731 | $state{handle}->push_read (line => $qr_nlnl, sub { |
544 | $_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix |
732 | $_[1] =~ /^HTTP\/([0-9\.]+) \s+ ([0-9]{3}) (?: \s+ ([^\015\012]*) )?/ix |
545 | or return (%state = (), $cb->(undef, { Status => 599, Reason => "invalid proxy connect response ($_[1])", URL => $url })); |
733 | or return (%state = (), $cb->(undef, { Status => 599, Reason => "Invalid proxy connect response ($_[1])", @pseudo })); |
546 | |
734 | |
547 | if ($2 == 200) { |
735 | if ($2 == 200) { |
548 | $rpath = $upath; |
736 | $rpath = $upath; |
549 | &$handle_actual_request; |
737 | &$handle_actual_request; |
550 | } else { |
738 | } else { |
551 | %state = (); |
739 | %state = (); |
552 | $cb->(undef, { Status => $2, Reason => $3, URL => $url }); |
740 | $cb->(undef, { Status => $2, Reason => $3, @pseudo }); |
553 | } |
741 | } |
554 | }); |
742 | }); |
555 | } else { |
743 | } else { |
556 | &$handle_actual_request; |
744 | &$handle_actual_request; |
557 | } |
745 | } |
558 | |
746 | |
559 | }, sub { |
747 | }, $arg{on_prepare} || sub { $timeout }; |
560 | $timeout |
|
|
561 | }; |
|
|
562 | }; |
748 | }; |
563 | |
749 | |
564 | defined wantarray && AnyEvent::Util::guard { %state = () } |
750 | defined wantarray && AnyEvent::Util::guard { %state = () } |
565 | } |
751 | } |
566 | |
752 | |
… | |
… | |
580 | &http_request |
766 | &http_request |
581 | } |
767 | } |
582 | |
768 | |
583 | =back |
769 | =back |
584 | |
770 | |
|
|
771 | =head2 DNS CACHING |
|
|
772 | |
|
|
773 | AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for |
|
|
774 | the actual connection, which in turn uses AnyEvent::DNS to resolve |
|
|
775 | hostnames. The latter is a simple stub resolver and does no caching |
|
|
776 | on its own. If you want DNS caching, you currently have to provide |
|
|
777 | your own default resolver (by storing a suitable resolver object in |
|
|
778 | C<$AnyEvent::DNS::RESOLVER>). |
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|
779 | |
585 | =head2 GLOBAL FUNCTIONS AND VARIABLES |
780 | =head2 GLOBAL FUNCTIONS AND VARIABLES |
586 | |
781 | |
587 | =over 4 |
782 | =over 4 |
588 | |
783 | |
589 | =item AnyEvent::HTTP::set_proxy "proxy-url" |
784 | =item AnyEvent::HTTP::set_proxy "proxy-url" |
590 | |
785 | |
591 | Sets the default proxy server to use. The proxy-url must begin with a |
786 | Sets the default proxy server to use. The proxy-url must begin with a |
592 | string of the form C<http://host:port> (optionally C<https:...>). |
787 | string of the form C<http://host:port> (optionally C<https:...>), croaks |
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|
788 | otherwise. |
|
|
789 | |
|
|
790 | To clear an already-set proxy, use C<undef>. |
593 | |
791 | |
594 | =item $AnyEvent::HTTP::MAX_RECURSE |
792 | =item $AnyEvent::HTTP::MAX_RECURSE |
595 | |
793 | |
596 | The default value for the C<recurse> request parameter (default: C<10>). |
794 | The default value for the C<recurse> request parameter (default: C<10>). |
597 | |
795 | |
598 | =item $AnyEvent::HTTP::USERAGENT |
796 | =item $AnyEvent::HTTP::USERAGENT |
599 | |
797 | |
600 | The default value for the C<User-Agent> header (the default is |
798 | The default value for the C<User-Agent> header (the default is |
601 | C<Mozilla/5.0 (compatible; AnyEvent::HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>). |
799 | C<Mozilla/5.0 (compatible; U; AnyEvent-HTTP/$VERSION; +http://software.schmorp.de/pkg/AnyEvent)>). |
602 | |
800 | |
603 | =item $AnyEvent::HTTP::MAX_PERSISTENT |
801 | =item $AnyEvent::HTTP::MAX_PER_HOST |
604 | |
802 | |
605 | The maximum number of persistent connections to keep open (default: 8). |
803 | The maximum number of concurrent connections to the same host (identified |
|
|
804 | by the hostname). If the limit is exceeded, then the additional requests |
|
|
805 | are queued until previous connections are closed. |
606 | |
806 | |
607 | Not implemented currently. |
807 | The default value for this is C<4>, and it is highly advisable to not |
608 | |
808 | increase it. |
609 | =item $AnyEvent::HTTP::PERSISTENT_TIMEOUT |
|
|
610 | |
|
|
611 | The maximum time to cache a persistent connection, in seconds (default: 2). |
|
|
612 | |
|
|
613 | Not implemented currently. |
|
|
614 | |
809 | |
615 | =item $AnyEvent::HTTP::ACTIVE |
810 | =item $AnyEvent::HTTP::ACTIVE |
616 | |
811 | |
617 | The number of active connections. This is not the number of currently |
812 | The number of active connections. This is not the number of currently |
618 | running requests, but the number of currently open and non-idle TCP |
813 | running requests, but the number of currently open and non-idle TCP |
… | |
… | |
621 | =back |
816 | =back |
622 | |
817 | |
623 | =cut |
818 | =cut |
624 | |
819 | |
625 | sub set_proxy($) { |
820 | sub set_proxy($) { |
|
|
821 | if (length $_[0]) { |
626 | $PROXY = [$2, $3 || 3128, $1] if $_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix; |
822 | $_[0] =~ m%^(https?):// ([^:/]+) (?: : (\d*) )?%ix |
|
|
823 | or Carp::croak "$_[0]: invalid proxy URL"; |
|
|
824 | $PROXY = [$2, $3 || 3128, $1] |
|
|
825 | } else { |
|
|
826 | undef $PROXY; |
|
|
827 | } |
627 | } |
828 | } |
628 | |
829 | |
629 | # initialise proxy from environment |
830 | # initialise proxy from environment |
|
|
831 | eval { |
630 | set_proxy $ENV{http_proxy}; |
832 | set_proxy $ENV{http_proxy}; |
|
|
833 | }; |
631 | |
834 | |
632 | =head1 SEE ALSO |
835 | =head1 SEE ALSO |
633 | |
836 | |
634 | L<AnyEvent>. |
837 | L<AnyEvent>. |
635 | |
838 | |
636 | =head1 AUTHOR |
839 | =head1 AUTHOR |
637 | |
840 | |
638 | Marc Lehmann <schmorp@schmorp.de> |
841 | Marc Lehmann <schmorp@schmorp.de> |
639 | http://home.schmorp.de/ |
842 | http://home.schmorp.de/ |
640 | |
843 | |
|
|
844 | With many thanks to Дмитрий Шалашов, who provided countless |
|
|
845 | testcases and bugreports. |
|
|
846 | |
641 | =cut |
847 | =cut |
642 | |
848 | |
643 | 1 |
849 | 1 |
644 | |
850 | |