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From Alexey Panchenko <alex.panche...@gmail.com>
Subject Re: Spurious blank line being added to headers...
Date Thu, 17 Mar 2016 17:32:37 GMT
Are you sure that value of the X-CREDENTIALS header doesn't end with \r\n ?


On Thu, Mar 17, 2016 at 11:16 PM, Gordon Ross <gr306@uis.cam.ac.uk> wrote:

> I’m using HttpClient 4.3.6 on Java 1.7.0_95. I’m finding that in certain
> circumstances, HttpClient is adding a spurious blank line to the headers.
> This is then causing the far end server to treat the remaining headers as
> the body - not what is desired!
>
> If I run the code as a stand alone Java app, it works a treat. But
> sometimes, when run under Tomcat, I get this spurious blank line.
>
> I’ve switched on full wire tracing and I’m seeing:
>
> 2016-03-17 16:59:39,991 [TP-Processor3] DEBUG http.wire gr306 -
> http-outgoing-1 >> "POST /signin HTTP/1.1[\r][\n]"
> 2016-03-17 16:59:39,991 [TP-Processor3] DEBUG http.wire gr306 -
> http-outgoing-1 >> "X-CREDENTIALS: *SNIP*[\r][\n]"
> 2016-03-17 16:59:39,991 [TP-Processor3] DEBUG http.wire gr306 -
> http-outgoing-1 >> "[\r][\n]"
> 2016-03-17 16:59:39,991 [TP-Processor3] DEBUG http.wire gr306 -
> http-outgoing-1 >> "Accept: application/xml[\r][\n]"
> 2016-03-17 16:59:39,991 [TP-Processor3] DEBUG http.wire gr306 -
> http-outgoing-1 >> "Content-Type: application/xml[\r][\n]"
> 2016-03-17 16:59:39,991 [TP-Processor3] DEBUG http.wire gr306 -
> http-outgoing-1 >> "Content-Length: 0[\r][\n]"
> 2016-03-17 16:59:39,991 [TP-Processor3] DEBUG http.wire gr306 -
> http-outgoing-1 >> "Host: www.example.com:443[\r][\n]"
> 2016-03-17 16:59:39,991 [TP-Processor3] DEBUG http.wire gr306 -
> http-outgoing-1 >> "Connection: Keep-Alive[\r][\n]"
> 2016-03-17 16:59:39,991 [TP-Processor3] DEBUG http.wire gr306 -
> http-outgoing-1 >> "User-Agent: Apache-HttpClient/4.3.6 (java 1.5)[\r][\n]"
> 2016-03-17 16:59:39,991 [TP-Processor3] DEBUG http.wire gr306 -
> http-outgoing-1 >> "Accept-Encoding: gzip,deflate[\r][\n]"
> 2016-03-17 16:59:39,991 [TP-Processor3] DEBUG http.wire gr306 -
> http-outgoing-1 >> "[\r][\n]"
>
>
>
> I’ve added code to check the headers that I’m adding to the HTTPPost
> instance, and I’m not adding any blank or spurious headers.
>
>           httpPost = new HttpPost(path);
>
>           for(String header: headers.keySet())
>           {
>                   logger.trace("Adding Header to Request: " + header);
>                   httpPost.addHeader(header, headers.get(header));
>           }
>
> Shows:
>
> 2016-03-17 16:59:39,986 [TP-Processor3] TRACE util.BasicHttpClient gr306 -
> Adding Header to Request: X-CREDENTIALS
> 2016-03-17 16:59:39,986 [TP-Processor3] TRACE util.BasicHttpClient gr306 -
> Adding Header to Request: Accept
> 2016-03-17 16:59:39,986 [TP-Processor3] TRACE util.BasicHttpClient gr306 -
> Adding Header to Request: Content-Type
>
> As I said, when this same library code is run as a standalone Java app,
> the blank header line disappears.
>
> Any suggestions as to how I can track this down?
>
> Thank you.
>
> GTG
> --
> Gordon Ross,
> UIS Telecoms Office,
> University of Cambridge
>
>

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