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List:       jmeter-user
Subject:    Re: Encoding of image data changes when using HTTP Script Recorder
From:       sebb <sebbaz () gmail ! com>
Date:       2014-02-22 10:48:49
Message-ID: CAOGo0VbVRh3d-Wp_Z1W99+yOgjds3PU=cHzDzh1VW9hFy6CX0g () mail ! gmail ! com
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On 18 February 2014 12:23, Jonathan Harden <jharden@moonfruit.com> wrote:
> Hi,
>
> We're playing around with JMeter at the moment and wanted to sit JMeter
> between our test code and our backend HTTP service. We wanted to use
> JMeter to record all the tests that were performed but when we enable
> JMeter as an HTTP Proxy for our tests when a PUT request is made to
> upload an image the binary image data going into JMeter (which has an
> HTTP header Content-Type: image/jpeg) is considerably changed inside
> JMeter.
>
> I stuck a Charles proxy between the tests and JMeter and then between
> JMeter and the backend so I could see exactly what went in and what came
> out. I get the following results:
>
> The Request headers (I'll not include the binary, but a hexdump of the
> binary shows it to be malformed on exit) from our tests going into
> JMeter:
>
> PUT http://127.0.0.1:58082/image/abc HTTP/1.1
> Host: 127.0.0.1:58082
> Content-Length: 6504
> Content-Type: image/jpeg
> Accept-Encoding: gzip, deflate, compress
> Accept: */*
> User-Agent: python-requests/2.2.1 CPython/2.7.6 Linux/3.12-1-amd64
>
> The request headers which JMeter sends:
>
> PUT /image/abc HTTP/1.1
> Connection: keep-alive
> Content-Type: image/jpeg
> Accept: */*
> User-Agent: python-requests/2.2.1 CPython/2.7.6 Linux/3.12-1-amd64
> Accept-Encoding: gzip, deflate, compress
> Content-Length: 11261
> Host: 127.0.0.1:58082
>
> You can see the Content-Length is totally different and so our tests
> break when a following GET request doesn't get back the same data.
>
> I'm using JMeter 2.11 (downloaded from the JMeter website) on Debian
> Jessie.
>
> In JMeter we've done the following:
>
> 1) Added an HTTP(S) Test Script Recorder to a blank WorkBench
> 2) Changed the Port number to 58081
> 3) Clicked start
>
> Then we run our tests and get the results above.
>
> Based on a bunch of searches we tried the following things which didn't
> help:
>
> 1) Set the HTTP Sampler Settings->Type to Java
> 2) Added a BSF Post Processing element to the Recorder with the
> following script: 'prev.setDataEncoding("UTF-8")'
>
> I'm now totally stumped, any suggestions as to a fix would be greatly
> appreciated, heck even just knowing what I'm doing is stupid would be
> awesome so I can go down a different route!
>
> If it looks like a bug I could boil down exactly what's happening to a
> tiny script and submit it as a bug report.

Yes, please do.

> Thanks,
>
> Jonathan

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