properly support an HTTP method of '0'

This is valid according to RFC9110: see
https://datatracker.ietf.org/doc/html/rfc9110#appendix-A for the full ABNF,
which is equivalent to the regex: ^[a-zA-Z0-9!#$%&'*+.^_`|~-]+$

Author: karenetheridge

Changes

@@ -1,6 +1,7 @@
 Revision history for HTTP-Message
 
 {{$NEXT}}
+    - now handling HTTP method '0' (Karen Etheridge)
 
 7.00      2024-10-07 15:31:56Z
     - Stop transforming LF into CRLF. Fixes #69 (GH#196) (Olaf Alders)

lib/HTTP/Request.pm

@@ -118,7 +118,8 @@ sub as_string
     my($eol) = @_;
     $eol = "\n" unless defined $eol;
 
-    my $req_line = $self->method || "-";
+    # method must be at least one char, matching ^[a-zA-Z0-9!#$%&'*+.^_`|~-]+$
+    my $req_line = (length $self->method) ? $self->method : "-";
     my $uri = $self->uri;
     $uri = (defined $uri) ? $uri->as_string : "-";
     $req_line .= " $uri";
@@ -131,7 +132,7 @@ sub as_string
 sub dump
 {
     my $self = shift;
-    my @pre = ($self->method || "-", $self->uri || "-");
+    my @pre = ((length $self->method) ? $self->method : "-", (defined $self->uri) ? $self->uri : "-");
     if (my $prot = $self->protocol) {
 	push(@pre, $prot);
     }

t/request.t

@@ -5,7 +5,7 @@ use strict;
 use warnings;
 
 use Test::More;
-plan tests => 39;
+plan tests => 43;
 
 use HTTP::Request;
 use Try::Tiny qw( catch try );
@@ -166,3 +166,13 @@ $r2 = HTTP::Request->parse('methonly http://www.example.com/');
 is( $r2->method,   'methonly' );
 is( $r2->uri,      'http://www.example.com/' );
 is( $r2->protocol, undef );
+
+my $r3 = HTTP::Request->new(0 => "0");
+is($r3->method, '0', '0 is a valid HTTP method');
+is($r3->uri, '0', '0 is a valid URI');
+is($r3->as_string, "0 0\n\n", 'parsed zero method, zero uri req');
+is($r3->dump, <<EOT, 'dumped zero method, zero uri req');
+0 0
+
+(no content)
+EOT