proxy_pass fails after calling $r->has_request_body()

[Igor Sysoev]

On Thu, Dec 20, 2007 at 05:58:43AM +0100, Ben Grimm wrote:

> Hi, I'm trying to parse a request in a perl handler, extract a value
> from it and use that to set a variable for use in a proxy_pass mapping.
> GET requests work fine, but POST's fail.  I suspect that the proxy_pass
> is trying re-read the  request body.  Is there a better way to
> accomplish do this?
> 
> location ^~ /@map/ {
>    internal;
>    perl ProxyMap::handler;
> }
> 
> location ^~ /@backend/ {
>    internal;
>    proxy_pass  http://backend/;
> }
> 
> #####
> package ProxyMap;
> sub handler {
>     my $r = shift;
>     return OK if $r->has_request_body(\&handle_request);
>     return handle_request($r);
> }
> ## this is reduced to the simplest example I could make
> sub handle_request {
>     my $r = shift;
>     my $backend = 'backend';
>     my $uri = $r->uri;
>     $uri =~ s/\@map/\@$backend/;
>     $r->internal_redirect($uri);
>     return OK;
> }
> 1;

No, proxy_pass should not read the body in this case. I will look.

Other ways:

1) You have not to check $r->has_request_body(): you may call
   $r->internal_redirect at once.

2) in 0.6.21+ you may use a variable in proxy_pass:

   location ^~ /@map/  {
      proxy_pass   http://$backend;
   }

and set the variable using perl_set.


-- 
Igor Sysoev
http://sysoev.ru/en/