From: Eric Hodel <drbrain@...7.net>
Date: 2006-02-12T16:18:26+09:00
Subject: Re: odd http header corruption

On Feb 9, 2006, at 9:48 AM, Sam Joseph wrote:

> Eric Hodel wrote:
>
>> On Feb 8, 2006, at 6:18 AM, Sam Joseph wrote:
>>
>>> Or some interaction of the two :-)  The thing I'm really keen to   
>>> work out is how the actioncontroller cgi_process.rb generates  
>>> the  output before the odd thingy, i.e.
>>>
>>> HTTP/1.x 200 OK
>>> Date: Thu, 02 Feb 2006 20:56:03 GMT
>>> Server: Apache/2.0.54 (Debian GNU/Linux) PHP/4.3.10-16
>>>
>>> Since placing a newline before any output from CgiReponse.out   
>>> places that new line after these three lines, so where are they   
>>> generated?  I can't work it out.
>>
>> They are generated by Apache.
>
> Ah that makes sense.
>
>> What do you get when you run  dispatch.cgi from the command line?
>
> I get:
>
> Status: 500 Internal Server Error
>
> The only operational code I see in dispatch.cgi is  
> Dispatcher.dispatch - I guess that's just passing the incoming  
> request to the appropriate controller.  I guess you're saying that  
> Apache prints the first three lines, and then appends the rest of  
> the output from rails.  But presumably the status code needs to be  
> communicated from rails to Apache - do you know how this happens?

It is part of the CGI "spec".

> That makes sense now.  I guess it would be nice to be able to call  
> dispatch.cgi from the command line passing in the appropriate  
> parameters to see exactly what it spits back ...  I tried the  
> following:
>
> ./dispatch.cgi /discussions/tree/1
> Status: 500 Internal Server Error
>
> so it's not as simple as that.

You need to set up the complete request environment first.  Things  
like REQUEST_METHOD and PATH_INFO and so-forth.

-- 
Eric Hodel - drbrain@segment7.net - http://segment7.net
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