[fpc-pascal] Is Path_Info available in FastCGI working as proxy?

silvioprog silvioprog at gmail.com
Thu Jan 29 23:28:14 CET 2015


On Thu, Jan 29, 2015 at 6:58 PM, Michael Van Canneyt <michael at freepascal.org
> wrote:
>
> On Thu, 29 Jan 2015, silvioprog wrote:
>
>> Hello,
>>
>> I've the same problem in Apache and nginx: TRequest.PathInfo always
>> returns an empty string.
>>
>> In Apache, I'm using the the mod_proxy_fcgi module already distributed in
>> Apache 24. In nginx, I'm using this configuration:
>>
>> location /dev/duallsms {
>> fastcgi_pass  localhost:8080;
>> ... other configurations ...
>> fastcgi_param PATH_INFO $fastcgi_path_info; # from nginx docs
>> }
>>
>> First I've tested it on Windows, but I've noticed that it fail in Linux
>> too. So I ask: is PATH_INFO available in FastCGI (working as proxy)? If
>> not, what I use instead it?!
>>
>
> PATH_INFO is not always available, you need to configure that in apache
> and/or nginx.
>

Thanks for the information.


> See http://httpd.apache.org/docs/trunk/mod/mod_proxy_fcgi.html
>
> The FPC fcl-web components by themselves do not try to reconstruct
> PATH_INFO.
> You can try determining it from SCRIPT_URI  or SCRIPT_NAME.


Hm... what do you think about to read it from the REQUEST_URI param? If it
is good, you need to do a small change in FCL (if relevant hehe). The patch
in attached allows to use the implementation below:

program project1;

{$mode objfpc}{$H+}

uses
  HttpDefs, custfcgi;

type

  { TMyFCGIRequest }

  TMyFCGIRequest = class(TFCGIRequest)
  public
    property CGIParams;
  end;

  { TMyFCGIHandler }

  TMyFCGIHandler = class(TFCGIHandler)
  public
    function CreateRequest: TFCGIRequest; override;
    procedure HandleRequest(ARequest: TRequest; AResponse: TResponse);
override;
  end;

  { TMyFCGIHandler }

  function TMyFCGIHandler.CreateRequest: TFCGIRequest;
  begin
    Result := TMyFCGIRequest.Create;
  end;

  procedure TMyFCGIHandler.HandleRequest(ARequest: TRequest; AResponse:
TResponse);
  begin
    // open "
http://localhost/dev/duallsms/pesquisa/contato?campo=nome&filtro=fulano"
and get
    // the "REQUEST_URI:
/dev/duallsms/pesquisa/contato?campo=nome&filtro=fulano" output
    AResponse.Contents.Text := 'REQUEST_URI: ' +
      TMyFCGIRequest(ARequest).CGIParams.Values['REQUEST_URI'];
  end;

begin
  with TMyFCGIHandler.Create(nil) do
  try
    Port := 8080;
    Run;
  finally
    Free;
  end;
end.

--
Silvio Cl├ęcio
My public projects - github.com/silvioprog
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