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Re: HTTP::Proxy : changing the URI

by !1 (Hermit)
on Dec 15, 2004 at 19:28 UTC ( #415166=note: print w/replies, xml ) Need Help??

in reply to HTTP::Proxy : changing the URI

Ah, where to begin?

  1. $headers are the headers that are going to be sent back to the connection that made the request to the proxy. $message is either going to be an HTTP::Request or an HTTP::Response object. You specifically want to filter HTTP::Requests.
  2. What is $message->$headers->header supposed to do?
  3. You should be using HTTP::Proxy::HeaderFilter::simple. You may have been getting a message along the lines of "HTTP::Proxy::HeaderFilter cannot be used as a filter".
  4. You're going to need to patch HTTP::Proxy to rewrite the requested uri for you somewhere in HTTP::Proxy::serve_connections. Right now it's getting undef when it checks $req->uri->scheme. To change this up, you can have something along the lines of:
    $req->uri( $self->url . substr($req->uri,1) ) if $req->uri =~ m!^/!;
    Please note that if you do not filter this request, your proxy will redirect to itself time and time again. Also, set your host to something.

Hopefully something in here will help you.

Replies are listed 'Best First'.
Re^2: HTTP::Proxy : changing the URI
by insaniac (Friar) on Dec 16, 2004 at 08:14 UTC
    sorry i reply just now... i was pretty tired yesterday evening, so i didn't touch a pc after work ;-)

    i showed you a bad example of my code, the working code does use the HTTP::Proxy::HeaderFilter::simple. (otherwise the filter doesn't work; like you also mentioned). i've added the working code to end of this reply.
    the $message->$headers->header should have been $message->header (when using HTTP::Proxy::HeaderFilter::simple), and that methods sets or gets a header variable. about the patch: yeah, I thought it was something like that, but is the error really coming from HTTP::Proxy?

    anyhow, thanx a bunch for the tips, the patch-tip is probably going to be the most successful one... but i'll keep you posted (btw: we already arranged that the product that's supposed to use this proxy, will use it as a proxy (so it will make "correct" requests). so actually my problem is solved, but I still want to see if this idea would work.. it would be cool, no?)

    #!/usr/local/bin/perl -w use strict; use HTTP::Proxy qw/:log/; use HTTP::Headers ; use HTTP::Proxy::HeaderFilter::simple; # Variable init my $host = undef; my $port = 80; my $log_file = "/tmp/proxy.log"; my $localhost = "proxy_host"; my $remotehost = "forwarded_host"; my $agent_timeout = 10; sub search_credentials { my($iv_user,$iv_group) = @_; my($ht_user,$ht_passwd); # test example $ht_user = 'some_web_user'; $ht_passwd = 'passwd'; return ($ht_user,$ht_passwd); } open(LOG,">>", $log_file); my $proxy = HTTP::Proxy->new; $proxy->port($port); $proxy->host($host); $proxy->logfh(*LOG); $proxy->logmask(STATUS | PROCESS | HEADERS | FILTER); # Debug logging my $filter = HTTP::Proxy::HeaderFilter::simple->new( sub { my ( $self, $headers, $message ) = @_; my $get_uri = $message->uri() ? $message->uri() : "http://$rem +otehost/"; if( $get_uri =~ m%^/%) { print "Unaltered URI: $get_uri\n"; $get_uri =~ s?^/?http://$remotehost/? ; print "Altered URI: $get_uri\n"; } my $iv_user = $message->header('iv-user'); my $iv_group = $message->header('iv-group'); my($ht_user,$ht_passwd) = search_credentials($iv_user,$iv_grou +p); $message->authorization_basic($ht_user,$ht_passwd); } ); $proxy->push_filter(request => $filter ); # this is the mainloop $proxy->start;
    to ask a question is a moment of shame
    to remain ignorant is a lifelong shame
Re^2: HTTP::Proxy : changing the URI
by insaniac (Friar) on Dec 16, 2004 at 09:03 UTC
    dude, you're patch tip works like a charm!!!! thanx a whole heap :-D
    pretty cool how it works now... pretty cool.. (i'm just a perl beginner, i'm constantly amazed about the power of perl :) )
    to ask a question is a moment of shame
    to remain ignorant is a lifelong shame

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