[ViewVC] Annotation of: cvs/AnyEvent-MCP/bin/mcp-http

#!/opt/bin/perl

=encoding utf8

=head1 NAME

mcp-http - HTTP requests with URL and method permissions

=head1 SYNOPSIS

   mcp-http --stdio
   mcp-http --connect http://host:port/TOKEN/http

=head1 DESCRIPTION

One MCP C<request> tool backed by L<AnyEvent::HTTP>. HTTP methods are
permission actions. URL scopes: exact URL, path with any query, origin,
hostname, hostname and subdomains, or any HTTP(S) URL.

Supply a C<cookie_jar> from an earlier response to continue a session;
the server keeps no cookies. This uses AnyEvent::HTTP's simplified jar,
not a full browser cookie implementation. Treat the jar as confidential.

Responses include status, headers, UTF-8 body or Base64 bytes. Optional
C<grep> keeps lines containing a literal string; C<regex> keeps lines
matching a Perl regex; C<substitute> replaces regex matches with literal
replacement text. C<max_bytes> bounds downloads and C<truncated> reports
partial results.

Redirects and retries are disabled. HTTPS verifies certificates.
Network access is NOT sandboxed; permitted names can reach local or
private hosts. HTTP failures do not prove that a write did not happen.

When spawned as a multibroker stdio child, the server exits after five
minutes without MCP requests and is restarted on demand. Directly connected
clients and HTTP listeners are unaffected.

=head1 FIRST USE

Configure your MCP client to launch:

   mcp-http --stdio --name web

Or combine it with other servers:

   mcp-multibroker --stdio web --- mcp-http --name web --stdio ---

Ask the assistant:

   Fetch https://example.org/ and report the status and page title.
   Do not submit forms or send any modifying requests.

The C<request> tool receives arguments such as:

   {"url": "https://example.org/", "method": "GET", "max_bytes": 8192}

The first request asks for permission to GET that URL. An approval for
GET does not authorize POST, and an approval for an exact URL need not
authorize its whole hostname. Review broader scope choices carefully,
especially on hosts serving private or local resources.

To carry a session between requests, supply the returned C<cookie_jar>
to the next call. To inspect a large text response without returning it
all, use C<grep> or C<regex> and a suitable C<max_bytes>. Redirect
responses are returned to the caller; they are not followed. Repeating
a failed modifying request can repeat its side effects.

=head1 TOOL

=over

=item request

Required C<url>. Optional C<method> (GET), C<headers>, UTF-8 C<body>
or C<body_base64>, C<cookie_jar>, C<timeout> (30s inactivity),
C<max_bytes> (65536 default, 2097152 maximum), C<grep>, C<regex>,
and C<substitute> with C<pattern> and C<replacement>. Responses contain
C<captured_bytes> and C<truncated>. Replacement text is literal.

=back

=head1 PERMISSIONS

Profile C<http-NAME>. Rules match HTTP method as C<action> and URL
as C<match.url>. Hostname and subdomain scopes are textual DNS suffixes,
not organizational or public-suffix boundaries. No sandbox grants.

=head1 OPTIONS

Shared switches are documented in
L<AnyEvent::MCP::Server::Simple/COMMON COMMAND-LINE OPTIONS>.
The following shared switch has HTTP-permission-specific behavior.

=over

=item --ask MODE

Select permission prompt handling: C<helper> (default) uses the local
permission helper; C<tty> or C<yad> selects only that interface;
C<mcp> forwards prompts to the MCP client; C<auto> uses client forms
when advertised, otherwise the local helper; C<none> denies unmatched
permission checks without prompting.

=back

=cut

use common::sense;

use MIME::Base64 ();
use Encode ();
use JSON::XS ();

use AnyEvent::HTTP ();
use AnyEvent::MCP ();
use AnyEvent::MCP::Server::Permissions ();

use AnyEvent::MCP::Server::Simple;

my $options = mcp_getoptions
   {
      usage       => "Usage: mcp-http [OPTION]...\n",
      description => "HTTP requests with URL/method permissions and caller-managed cookies.",
      examples    => "  mcp-http --stdio\n",
   };

@ARGV and die "Unexpected arguments\n";

mcp_permissions +AnyEvent::MCP::Server::Permissions->new (
   name => "http-$options->{name}",
);

mcp_config
   idle_exit          => 300,
   server_name        => "mcp-http",
   server_version     => $AnyEvent::MCP::VERSION,
   short_instructions => "HTTP requests with URL/method permissions; pass cookie_jar between calls. No redirects.",
   instructions       => "request makes authorized HTTP(S) requests. Method is the permission action. "
                      . "URL scopes range from exact URL to any HTTP(S) URL. No automatic redirects or retries. "
                      . "Pass a returned cookie_jar to subsequent calls. "
                      . "grep/regex select lines; substitute applies literal replacements. "
                      . "Responses may be truncated and failed writes can still have taken effect.",
   on_request         => sub {
      my ($server, $req) = @_;

      return mcp_log_request $server, $req
         unless $req->{method} eq "tools/call" && $req->{tool} eq "request";

      my $args = $req->{args};
      my $method = $args->{method} // "GET";
      my $url = $args->{url} // "";
      $method = "<invalid>" if ref $method;
      $url = "<invalid>" if ref $url;
      $url =~ s/[?#].*//s;
      $url =~ s{(://)[^/@]*@}{$1};
      $url =~ s/[\x00-\x1f\x7f]/ /g;

      mcp_log_request $server, $req,
         method => (substr $method, 0, 20),
         url    => (substr $url, 0, 160);
   };

sub url_scopes {
   my ($url) = @_;

   defined $url && !ref $url && $url !~ /[\x00-\x20\x7f]/
      or die "Invalid URL\n";
   $url =~ m{\A(https?)://(\[[0-9a-f:.]+\]|[a-z0-9.-]+)(?::([0-9]+))?([^#]*)(?:#.*)?\z}i
      or die "Expected HTTP(S) URL without userinfo\n";

   my ($scheme, $host, $port, $rest) = (lc $1, lc $2, $3, $4);
   !defined $port || $port >= 1 && $port <= 65535
      or die "Invalid URL port\n";
   $port = undef if defined $port && $port == ($scheme eq "https" ? 443 : 80);
   $rest =~ m{\A(?:/|\?|\z)} or die "Invalid URL path\n";
   $rest = "/$rest" unless $rest =~ m{\A/};

   my $origin = "$scheme://$host" . (defined $port ? ":$port" : "");
   my $path = $rest;
   $path =~ s/\?.*//s;
   my $full = "$origin$rest";
   my @choices = (
      { label => "Exact URL including query", match => $full },
      { label => "This path, any query",
        match => "^" . (quotemeta "$origin$path") . "(?:\\?.*)?\\z" },
      { label => "This origin (scheme, host, port)",
        match => "^" . (quotemeta $origin) . "/" },
      { label => "This hostname, any scheme or port",
        match => "^https?://" . (quotemeta $host) . "(?::[0-9]+)?/" },
   );
   if ($host !~ /^\[/ && $host =~ /\./ && $host !~ /^[0-9.]+$/) {
      push @choices, {
         label => "Hostname and subdomains, any scheme or port",
         match => "^https?://(?:[a-z0-9-]+\\.)*" . (quotemeta $host) . "(?::[0-9]+)?/",
      };
   }
   push @choices, { label => "Any HTTP(S) URL", match => "^https?://" };

   ($full, \@choices)
}

sub text_regex {
   my ($pattern) = @_;

   defined $pattern && !ref $pattern && length $pattern <= 512
      or die "Invalid regex pattern\n";
   my $regex = eval { qr/$pattern/ };
   $@ and die "Invalid regex: $@";

   $regex
}

sub filter_text {
   my ($text, $args) = @_;

   if (defined $args->{grep} || defined $args->{regex}) {
      my $grep = $args->{grep};
      my $regex = defined $args->{regex} ? text_regex ($args->{regex}) : undef;
      $text = join "", grep {
         (!defined $grep || index ($_, $grep) >= 0)
            && (!defined $regex || /$regex/)
      } split /(?<=\n)/, $text;
   }

   if (my $subst = $args->{substitute}) {
      my $regex = text_regex ($subst->{pattern});
      my $replacement = $subst->{replacement};
      $text =~ s/$regex/$replacement/g;
   }

   $text
}

mcp_tool request => "HTTP request. Method and URL permissions. No redirects; caller-managed cookie_jar returned. "
   . "UTF-8 body or Base64, bounded response, optional grep/regex/substitute.",
   {
      type => "object",
      required => ["url"],
      additionalProperties => JSON::XS::false,
      properties => {
         url         => { type => "string", minLength => 1 },
         method      => { type => "string", default => "GET" },
         headers     => { type => "object", additionalProperties => { type => "string" } },
         body        => { type => "string", description => "UTF-8 request body" },
         body_base64 => { type => "string", description => "Raw request body, Base64" },
         cookie_jar  => { type => "object", description => "AnyEvent::HTTP cookie jar returned by an earlier call" },
         timeout     => { type => "number", minimum => 1, maximum => 300, default => 30 },
         max_bytes   => { type => "integer", minimum => 1, maximum => 2097152, default => 65536 },
         grep        => { type => "string", description => "Keep lines containing this literal substring" },
         regex       => { type => "string", description => "Keep lines matching this Perl regex" },
         substitute  => {
            type => "object",
            required => ["pattern", "replacement"],
            additionalProperties => JSON::XS::false,
            properties => {
               pattern     => { type => "string", maxLength => 512 },
               replacement => { type => "string", maxLength => 512 },
            },
         },
      },
   },
   sub {
      my ($req, $args) = @_;

      my $method = $args->{method} // "GET";
      $method =~ /\A[A-Za-z0-9!#\$%&'*+.^_\x60|~-]+\z/
         or die "Invalid HTTP method\n";
      exists $args->{body} && exists $args->{body_base64}
         and die "Specify body or body_base64, not both\n";
      my ($url, $scopes) = url_scopes ($args->{url});

      my $headers = $args->{headers} || {};
      for my $key (keys %$headers) {
         $key =~ /\A[A-Za-z0-9!#\$%&'*+.^_\x60|~-]+\z/
            && defined $headers->{$key} && !ref $headers->{$key}
            && $headers->{$key} !~ /[\r\n\x00]/
            or die "Invalid HTTP header\n";
      }
      $headers = { %$headers };
      $headers->{"User-Agent"} = "mcp-http/$AnyEvent::MCP::VERSION"
         unless grep lc $_ eq "user-agent", keys %$headers;
      my $data = exists $args->{body} ? (AnyEvent::MCP::utf8enc $args->{body}) : undef;
      if (defined $args->{body_base64}) {
         $args->{body_base64} =~ /\A(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?\z/
            or die "Invalid Base64 body\n";
         $data = MIME::Base64::decode_base64 ($args->{body_base64});
      }
      !defined $data || length $data <= 1048576 or die "Request body exceeds 1 MiB\n";
      my $limit = $args->{max_bytes} // 65536;
      $limit >= 1 && $limit <= 2097152 or die "Invalid max_bytes\n";

      !defined $args->{grep} || !ref $args->{grep} or die "Invalid grep\n";
      text_regex ($args->{regex}) if defined $args->{regex};
      if (defined $args->{substitute}) {
         ref $args->{substitute} eq "HASH" && defined $args->{substitute}{replacement}
            && !ref $args->{substitute}{replacement} && length $args->{substitute}{replacement} <= 512
            or die "Invalid substitute\n";
         text_regex ($args->{substitute}{pattern});
      }
      my $jar = $args->{cookie_jar};
      !defined $jar || ref $jar eq "HASH" or die "Invalid cookie jar\n";

      $req->require_permission ({
         tool           => $req->{tool},
         action         => $method,
         dimensions     => { url => { label => "URL", value => $url, choices => $scopes } },
         sandbox_grants => [],
         reason         => "$method $url",
      });

      my $body = "";
      my $truncated = 0;
      my $response_headers;
      my $guard;
      $guard = AnyEvent::HTTP::http_request
         $method => $url,
         recurse    => 0,
         persistent => 0,
         proxy      => undef,
         tls_ctx    => "high",
         timeout    => $args->{timeout} // 30,
         headers    => $headers,
         (defined $data ? (body => $data) : ()),
         (defined $jar ? (cookie_jar => $jar) : ()),
         on_header => sub {
            $response_headers = { %{$_[0]} };
            1
         },
         on_body => sub {
            my ($part) = @_;
            if (length ($body) + length ($part) > $limit) {
               $body .= substr $part, 0, $limit - length $body;
               $truncated = 1;
               return 0;
            }
            $body .= $part;
            1
         },
         sub {
            my ($unused, $hdr) = @_;

            undef $guard;
            return if $req->{finished};
            $hdr = $response_headers if $truncated && $response_headers;
            my %result = (
               status         => 0 + $hdr->{Status},
               reason         => $hdr->{Reason},
               headers        => { map +($_ => $hdr->{$_}), grep /^[a-z]/, keys %$hdr },
               captured_bytes => length $body,
               truncated      => $truncated ? JSON::XS::true : JSON::XS::false,
               (defined $jar ? (cookie_jar => $jar) : ()),
            );

            if (defined $unused || $truncated) {
               my $bytes = $body;
               my $text = eval { Encode::decode ("UTF-8", $bytes, Encode::FB_CROAK) };
               if (defined $text) {
                  $text = filter_text ($text, $args);
                  if (length $text > $limit) {
                     $text = substr $text, 0, $limit;
                     $result{truncated} = JSON::XS::true;
                  }
                  $result{body} = $text;
               } elsif (defined $args->{grep} || defined $args->{regex} || defined $args->{substitute}) {
                  $req->error ("Cannot filter a non-UTF-8 response");
                  return;
               } else {
                  $result{body_base64} = MIME::Base64::encode_base64 ($body, "");
               }
            }

            $req->result (\%result);
         }
      ;
      $req->{on_cancel} = sub { undef $guard };
   };

mcp_start %$options;
Revision:	1.8
Committed:	Sat Nov 7 17:09:30 2026 UTC (6 hours, 32 minutes ago) by root
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.7:	+5 -0 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#!/opt/bin/perl
2
3			=encoding utf8
4
5			=head1 NAME
6
7			mcp-http - HTTP requests with URL and method permissions
8
9			=head1 SYNOPSIS
10
11			mcp-http --stdio
12			mcp-http --connect http://host:port/TOKEN/http
13
14			=head1 DESCRIPTION
15
16			One MCP C<request> tool backed by L<AnyEvent::HTTP>. HTTP methods are
17			permission actions. URL scopes: exact URL, path with any query, origin,
18			hostname, hostname and subdomains, or any HTTP(S) URL.
19
20			Supply a C<cookie_jar> from an earlier response to continue a session;
21			the server keeps no cookies. This uses AnyEvent::HTTP's simplified jar,
22			not a full browser cookie implementation. Treat the jar as confidential.
23
24			Responses include status, headers, UTF-8 body or Base64 bytes. Optional
25			C<grep> keeps lines containing a literal string; C<regex> keeps lines
26			matching a Perl regex; C<substitute> replaces regex matches with literal
27			replacement text. C<max_bytes> bounds downloads and C<truncated> reports
28			partial results.
29
30			Redirects and retries are disabled. HTTPS verifies certificates.
31			Network access is NOT sandboxed; permitted names can reach local or
32			private hosts. HTTP failures do not prove that a write did not happen.
33
34	root	1.8	When spawned as a multibroker stdio child, the server exits after five
35			minutes without MCP requests and is restarted on demand. Directly connected
36			clients and HTTP listeners are unaffected.
37
38	root	1.4	=head1 FIRST USE
39
40			Configure your MCP client to launch:
41
42			mcp-http --stdio --name web
43
44			Or combine it with other servers:
45
46			mcp-multibroker --stdio web --- mcp-http --name web --stdio ---
47
48			Ask the assistant:
49
50			Fetch https://example.org/ and report the status and page title.
51			Do not submit forms or send any modifying requests.
52
53			The C<request> tool receives arguments such as:
54
55			{"url": "https://example.org/", "method": "GET", "max_bytes": 8192}
56
57			The first request asks for permission to GET that URL. An approval for
58			GET does not authorize POST, and an approval for an exact URL need not
59			authorize its whole hostname. Review broader scope choices carefully,
60			especially on hosts serving private or local resources.
61
62			To carry a session between requests, supply the returned C<cookie_jar>
63			to the next call. To inspect a large text response without returning it
64			all, use C<grep> or C<regex> and a suitable C<max_bytes>. Redirect
65			responses are returned to the caller; they are not followed. Repeating
66			a failed modifying request can repeat its side effects.
67
68	root	1.1	=head1 TOOL
69
70			=over
71
72			=item request
73
74			Required C<url>. Optional C<method> (GET), C<headers>, UTF-8 C<body>
75			or C<body_base64>, C<cookie_jar>, C<timeout> (30s inactivity),
76			C<max_bytes> (65536 default, 2097152 maximum), C<grep>, C<regex>,
77			and C<substitute> with C<pattern> and C<replacement>. Responses contain
78			C<captured_bytes> and C<truncated>. Replacement text is literal.
79
80			=back
81
82			=head1 PERMISSIONS
83
84			Profile C<http-NAME>. Rules match HTTP method as C<action> and URL
85			as C<match.url>. Hostname and subdomain scopes are textual DNS suffixes,
86			not organizational or public-suffix boundaries. No sandbox grants.
87
88			=head1 OPTIONS
89
90	root	1.5	Shared switches are documented in
91			L<AnyEvent::MCP::Server::Simple/COMMON COMMAND-LINE OPTIONS>.
92	root	1.6	The following shared switch has HTTP-permission-specific behavior.
93	root	1.1
94			=over
95
96			=item --ask MODE
97
98	root	1.5	Select permission prompt handling: C<helper> (default) uses the local
99			permission helper; C<tty> or C<yad> selects only that interface;
100			C<mcp> forwards prompts to the MCP client; C<auto> uses client forms
101	root	1.6	when advertised, otherwise the local helper; C<none> denies unmatched
102			permission checks without prompting.
103	root	1.1
104			=back
105
106			=cut
107
108			use common::sense;
109	root	1.3
110			use MIME::Base64 ();
111			use Encode ();
112			use JSON::XS ();
113
114	root	1.1	use AnyEvent::HTTP ();
115			use AnyEvent::MCP ();
116			use AnyEvent::MCP::Server::Permissions ();
117
118			use AnyEvent::MCP::Server::Simple;
119
120			my $options = mcp_getoptions
121			{
122			usage => "Usage: mcp-http [OPTION]...\n",
123			description => "HTTP requests with URL/method permissions and caller-managed cookies.",
124			examples => " mcp-http --stdio\n",
125	root	1.6	};
126	root	1.1
127			@ARGV and die "Unexpected arguments\n";
128
129	root	1.7	mcp_permissions +AnyEvent::MCP::Server::Permissions->new (
130	root	1.1	name => "http-$options->{name}",
131			);
132
133			mcp_config
134	root	1.8	idle_exit => 300,
135	root	1.1	server_name => "mcp-http",
136			server_version => $AnyEvent::MCP::VERSION,
137			short_instructions => "HTTP requests with URL/method permissions; pass cookie_jar between calls. No redirects.",
138			instructions => "request makes authorized HTTP(S) requests. Method is the permission action. "
139			. "URL scopes range from exact URL to any HTTP(S) URL. No automatic redirects or retries. "
140			. "Pass a returned cookie_jar to subsequent calls. "
141			. "grep/regex select lines; substitute applies literal replacements. "
142			. "Responses may be truncated and failed writes can still have taken effect.",
143			on_request => sub {
144			my ($server, $req) = @_;
145
146			return mcp_log_request $server, $req
147			unless $req->{method} eq "tools/call" && $req->{tool} eq "request";
148
149			my $args = $req->{args};
150			my $method = $args->{method} // "GET";
151			my $url = $args->{url} // "";
152			$method = "<invalid>" if ref $method;
153			$url = "<invalid>" if ref $url;
154			$url =~ s/[?#].*//s;
155			$url =~ s{(://)[^/@]*@}{$1};
156			$url =~ s/[\x00-\x1f\x7f]/ /g;
157
158	root	1.2	mcp_log_request $server, $req,
159			method => (substr $method, 0, 20),
160			url => (substr $url, 0, 160);
161	root	1.1	};
162
163			sub url_scopes {
164			my ($url) = @_;
165
166			defined $url && !ref $url && $url !~ /[\x00-\x20\x7f]/
167			or die "Invalid URL\n";
168			$url =~ m{\A(https?)://(\[[0-9a-f:.]+\]\|[a-z0-9.-]+)(?::([0-9]+))?([^#])(?:#.)?\z}i
169			or die "Expected HTTP(S) URL without userinfo\n";
170
171			my ($scheme, $host, $port, $rest) = (lc $1, lc $2, $3, $4);
172			!defined $port \|\| $port >= 1 && $port <= 65535
173			or die "Invalid URL port\n";
174			$port = undef if defined $port && $port == ($scheme eq "https" ? 443 : 80);
175			$rest =~ m{\A(?:/\|\?\|\z)} or die "Invalid URL path\n";
176			$rest = "/$rest" unless $rest =~ m{\A/};
177
178			my $origin = "$scheme://$host" . (defined $port ? ":$port" : "");
179			my $path = $rest;
180			$path =~ s/\?.*//s;
181			my $full = "$origin$rest";
182			my @choices = (
183			{ label => "Exact URL including query", match => $full },
184			{ label => "This path, any query",
185			match => "^" . (quotemeta "$origin$path") . "(?:\\?.*)?\\z" },
186			{ label => "This origin (scheme, host, port)",
187			match => "^" . (quotemeta $origin) . "/" },
188			{ label => "This hostname, any scheme or port",
189			match => "^https?://" . (quotemeta $host) . "(?::[0-9]+)?/" },
190			);
191			if ($host !~ /^\[/ && $host =~ /\./ && $host !~ /^[0-9.]+$/) {
192			push @choices, {
193			label => "Hostname and subdomains, any scheme or port",
194			match => "^https?://(?:[a-z0-9-]+\\.)*" . (quotemeta $host) . "(?::[0-9]+)?/",
195			};
196			}
197			push @choices, { label => "Any HTTP(S) URL", match => "^https?://" };
198
199			($full, \@choices)
200			}
201
202			sub text_regex {
203			my ($pattern) = @_;
204
205			defined $pattern && !ref $pattern && length $pattern <= 512
206			or die "Invalid regex pattern\n";
207			my $regex = eval { qr/$pattern/ };
208			$@ and die "Invalid regex: $@";
209
210			$regex
211			}
212
213			sub filter_text {
214			my ($text, $args) = @_;
215
216			if (defined $args->{grep} \|\| defined $args->{regex}) {
217			my $grep = $args->{grep};
218			my $regex = defined $args->{regex} ? text_regex ($args->{regex}) : undef;
219			$text = join "", grep {
220			(!defined $grep \|\| index ($_, $grep) >= 0)
221			&& (!defined $regex \|\| /$regex/)
222			} split /(?<=\n)/, $text;
223			}
224
225			if (my $subst = $args->{substitute}) {
226			my $regex = text_regex ($subst->{pattern});
227			my $replacement = $subst->{replacement};
228			$text =~ s/$regex/$replacement/g;
229			}
230
231			$text
232			}
233
234			mcp_tool request => "HTTP request. Method and URL permissions. No redirects; caller-managed cookie_jar returned. "
235			. "UTF-8 body or Base64, bounded response, optional grep/regex/substitute.",
236			{
237			type => "object",
238			required => ["url"],
239			additionalProperties => JSON::XS::false,
240			properties => {
241			url => { type => "string", minLength => 1 },
242			method => { type => "string", default => "GET" },
243			headers => { type => "object", additionalProperties => { type => "string" } },
244			body => { type => "string", description => "UTF-8 request body" },
245			body_base64 => { type => "string", description => "Raw request body, Base64" },
246			cookie_jar => { type => "object", description => "AnyEvent::HTTP cookie jar returned by an earlier call" },
247			timeout => { type => "number", minimum => 1, maximum => 300, default => 30 },
248			max_bytes => { type => "integer", minimum => 1, maximum => 2097152, default => 65536 },
249			grep => { type => "string", description => "Keep lines containing this literal substring" },
250			regex => { type => "string", description => "Keep lines matching this Perl regex" },
251			substitute => {
252			type => "object",
253			required => ["pattern", "replacement"],
254			additionalProperties => JSON::XS::false,
255			properties => {
256			pattern => { type => "string", maxLength => 512 },
257			replacement => { type => "string", maxLength => 512 },
258			},
259			},
260			},
261			},
262			sub {
263			my ($req, $args) = @_;
264
265			my $method = $args->{method} // "GET";
266			$method =~ /\A[A-Za-z0-9!#\$%&'*+.^_\x60\|~-]+\z/
267			or die "Invalid HTTP method\n";
268			exists $args->{body} && exists $args->{body_base64}
269			and die "Specify body or body_base64, not both\n";
270			my ($url, $scopes) = url_scopes ($args->{url});
271
272			my $headers = $args->{headers} \|\| {};
273			for my $key (keys %$headers) {
274			$key =~ /\A[A-Za-z0-9!#\$%&'*+.^_\x60\|~-]+\z/
275			&& defined $headers->{$key} && !ref $headers->{$key}
276			&& $headers->{$key} !~ /[\r\n\x00]/
277			or die "Invalid HTTP header\n";
278			}
279			$headers = { %$headers };
280			$headers->{"User-Agent"} = "mcp-http/$AnyEvent::MCP::VERSION"
281			unless grep lc $_ eq "user-agent", keys %$headers;
282			my $data = exists $args->{body} ? (AnyEvent::MCP::utf8enc $args->{body}) : undef;
283			if (defined $args->{body_base64}) {
284			$args->{body_base64} =~ /\A(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{2}==\|[A-Za-z0-9+\/]{3}=)?\z/
285			or die "Invalid Base64 body\n";
286			$data = MIME::Base64::decode_base64 ($args->{body_base64});
287			}
288			!defined $data \|\| length $data <= 1048576 or die "Request body exceeds 1 MiB\n";
289			my $limit = $args->{max_bytes} // 65536;
290			$limit >= 1 && $limit <= 2097152 or die "Invalid max_bytes\n";
291
292			!defined $args->{grep} \|\| !ref $args->{grep} or die "Invalid grep\n";
293			text_regex ($args->{regex}) if defined $args->{regex};
294			if (defined $args->{substitute}) {
295			ref $args->{substitute} eq "HASH" && defined $args->{substitute}{replacement}
296			&& !ref $args->{substitute}{replacement} && length $args->{substitute}{replacement} <= 512
297			or die "Invalid substitute\n";
298			text_regex ($args->{substitute}{pattern});
299			}
300			my $jar = $args->{cookie_jar};
301			!defined $jar \|\| ref $jar eq "HASH" or die "Invalid cookie jar\n";
302
303			$req->require_permission ({
304			tool => $req->{tool},
305			action => $method,
306			dimensions => { url => { label => "URL", value => $url, choices => $scopes } },
307			sandbox_grants => [],
308			reason => "$method $url",
309			});
310
311			my $body = "";
312			my $truncated = 0;
313			my $response_headers;
314			my $guard;
315			$guard = AnyEvent::HTTP::http_request
316			$method => $url,
317			recurse => 0,
318			persistent => 0,
319			proxy => undef,
320			tls_ctx => "high",
321			timeout => $args->{timeout} // 30,
322			headers => $headers,
323			(defined $data ? (body => $data) : ()),
324			(defined $jar ? (cookie_jar => $jar) : ()),
325			on_header => sub {
326			$response_headers = { %{$_[0]} };
327			1
328			},
329			on_body => sub {
330			my ($part) = @_;
331			if (length ($body) + length ($part) > $limit) {
332			$body .= substr $part, 0, $limit - length $body;
333			$truncated = 1;
334			return 0;
335			}
336			$body .= $part;
337			1
338			},
339			sub {
340			my ($unused, $hdr) = @_;
341
342			undef $guard;
343			return if $req->{finished};
344			$hdr = $response_headers if $truncated && $response_headers;
345			my %result = (
346			status => 0 + $hdr->{Status},
347			reason => $hdr->{Reason},
348			headers => { map +($_ => $hdr->{$_}), grep /^[a-z]/, keys %$hdr },
349			captured_bytes => length $body,
350			truncated => $truncated ? JSON::XS::true : JSON::XS::false,
351			(defined $jar ? (cookie_jar => $jar) : ()),
352			);
353
354			if (defined $unused \|\| $truncated) {
355			my $bytes = $body;
356			my $text = eval { Encode::decode ("UTF-8", $bytes, Encode::FB_CROAK) };
357			if (defined $text) {
358			$text = filter_text ($text, $args);
359			if (length $text > $limit) {
360			$text = substr $text, 0, $limit;
361			$result{truncated} = JSON::XS::true;
362			}
363			$result{body} = $text;
364			} elsif (defined $args->{grep} \|\| defined $args->{regex} \|\| defined $args->{substitute}) {
365			$req->error ("Cannot filter a non-UTF-8 response");
366			return;
367			} else {
368			$result{body_base64} = MIME::Base64::encode_base64 ($body, "");
369			}
370			}
371
372			$req->result (\%result);
373			}
374			;
375			$req->{on_cancel} = sub { undef $guard };
376			};
377
378			mcp_start %$options;