VS2010, Web Performance Test, No hidden field detected on large response (>5MB)

I have a web performance test which contains a request whose response is greater than 5MB, and th开发者_StackOverflow社区e Extract Hidden Fields rule fails to find (necessary and required!) hidden fields in the response.

Response header contains

HTTP/1.1 200 OK
Transfer-Encoding : chunked
Vary : Accept-Encoding, User-Agent
Cache-Control : private
Content-Type : text/plain; charset=utf-8
Date : Sat, 19 Feb 2011 15:24:38 GMT
Server : Microsoft-IIS/6.0
X-AspNet-Version : 2.0.50727
X-Powered-By : ASP.NET

Other than that and the response size, there is nothing remarkable about this scenario. In fact, this same test succeeds when a smaller data set is used.

I suspect the Web Performance Test framework is having issues parsing the "chunked" encoding or sheer volume of data.

Ahem, how can I obtain these required hidden fields from my response? Any hints or pointers would be much appreciated. ie resolutions, work arounds, converting auto-extraction to manual, etc.

Cheers!

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Alright, so after much fussing around, found this neat little article, which indicates web test recorder captures ONLY first 1.5MB of data returned from request. In summary, the solution is to convert web test to a coded web test, and increase the test's ResponseBodyCaptureLimit to desired size.