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I am new in visual studio 2008 Web test. I tried to record to fiddler my web site which deployed in IIS 6.0 and GZIP compression is enabled. I saved the session generated by fiddler to .webtest file extension. I attached the webtest file to vs 2008 and run the web test. I notice that the result of webtest page bytes is different from the content-lenght or body recorded in fiddler.

with GZIP compression:

Webtest bytes vs fiddler body

914,330 vs 45,840

I also try with no gzip compression: This is the result bytes from webtest result: Bytes

Webtest bytes vs fiddler body

1,181,623 vs 406,353

Question: In webtest result, does the column Bytes represent the content-length of the page? if not what does the Bytes column represent?

I also notice that if the GZIP compression is enabled the webtest result response content-length is not shown in the response tab?

Can anyone explain the difference of the result?

Thank you.

Nat
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Jeff
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3 Answers3

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Check that the Visual Studio load test is not emulating IE 6 without Gzip compression support. Otherwise check the content header is correct.

Having a look at the traffic captured by fiddler and the playback from a webtest, I would be tempted to put any difference down to the fact that the Visual Studio load test is going to request and record a lot fewer items than fiddler will.

Community
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Nat
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  • I've check the request Accept-Encoding: GZIP. I already try to replace the browser type of localtestrun.testrunconfig but still the result of page bytes is not the same as the result of fiddler content-lenght? – Jeff Feb 02 '10 at 23:02
  • How much is the difference? Enough to represent unzipped files? – Nat Feb 02 '10 at 23:58
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with GZIP compression: This is the result bytes from webtest result:

Bytes

914,330

And this was the result from fiddler:

Body

45,840

I also try with no gzip compression: This is the result bytes from webtest result:

Bytes

1,181,623

And this was the result from fiddler:

Body

406,353

Question: In webtest result, is the column Bytes represents the content-length of the page? if not what is this Bytes column represents for?

I also notice that if the GZIP compression is enabled the webtest result response content-length is not shown in the response tab?

jeff
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Ok but I'm not yet trying it to load test. I usually check first the webtest that is why I'm wondering that the response content-length of web test is different from fiddler's content-length.

jeff
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