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Date: Fri, 15 Sep 2006 06:09:22 -0700 (PDT)
From: "Roland Weber (JIRA)" <jira@apache.org>
To: httpclient-dev@jakarta.apache.org
Subject: [jira] Commented: (HTTPCLIENT-600) Http Client does not fix
 incorrect content-lenght headers
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    [ http://issues.apache.org/jira/browse/HTTPCLIENT-600?page=comments#action_12434962 ] 
            
Roland Weber commented on HTTPCLIENT-600:
-----------------------------------------

Hi Denis,

HttpClient behaves exactly as intended. If there is no Content-Length header, HttpClient tries to compute one.
If you think you know better what the Content-Length header should be, and set it explicitly, then you do so on
your own risk and responsibility. HttpClient will not modify headers that were set explicitly. That's mainly because
somebody might have to create requests that are actually invalid, but are similar to what some other, broken
HTTP application generates. If you want HttpClient to provide the content length, then just don't set it. If you
want to verify the value you set, then use RequestEntity.getContentLength() in your application.

Reverse proxies are supposed to know which headers can be sent on and which can not. A proxy that
modifies the request entity is also responsible for updating all entity headers that might be affected by
that change. Please open an issue against the reverse proxy program that misbehaves.

I suggest to mark this issue invalid.

cheers,
  Roland


> Http Client does not fix incorrect content-lenght headers
> ---------------------------------------------------------
>
>                 Key: HTTPCLIENT-600
>                 URL: http://issues.apache.org/jira/browse/HTTPCLIENT-600
>             Project: HttpComponents HttpClient
>          Issue Type: Improvement
>          Components: HttpClient
>    Affects Versions: 3.1 Alpha 1
>         Environment: All
>            Reporter: Denis Valdenaire
>
> I discovered that the method 
> addContentLengthRequestHeader (found in file methods/MultipartPostMethod.java) doesn't "fix" the content-lenght when this one is incorrect. It adds one if getRequestHeader("Content-Lenght") is null, but it should also verify that the content-lenght is correct.
> I suggest something like :
> long len = getRequestContentLength();
> if (getRequestHeader("Content-Length") == null || getRequestHeader("Content-Length") != len) { 
>             setRequestHeader("Content-Length", String.valueOf(len));
> }
> Sending an incorrect Content-Length blocks the server if the string sent is smaller than announced : waiting for more, and finally reset the connection. If it's too big, you lose data.
> I've seen this problem in a reverse proxy program (with httpclient communicating with the real servers) when the client send urlencoded data and this data is modified (partly urldecoded) but not the content-lenght.

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