"400 Bad Request" - error with Cache control with bot

Homer Simpson72 · Dec 31, 2015

I am trying to develop a method in C# that downloads Recaptcha V2 images and display them in a picturebox in a Windows Form. I asked a question previously on this and so far it's the only answer that has got me anywhere. The issue I am running into now is that whenever I try to download the ReCaptcha V2 image I run into a 400 Bad Request. I have tried tracking the problem with Fiddler, and it says that Cache-control is set to No Cache and that pre-check and post-check tokens are meaningless. Is there a way I can resolve this Fiddler error? I am still a newbie and I can't post any code without triggering the moderation system. I am using HttpWebRequest/httpwebresponse methods.

NullReferenceX · Jan 1, 2016

Homer Simpson72 said:
I am trying to develop a method in C# that downloads Recaptcha V2 images and display them in a picturebox in a Windows Form. I asked a question previously on this and so far it's the only answer that has got me anywhere. The issue I am running into now is that whenever I try to download the ReCaptcha V2 image I run into a 400 Bad Request. I have tried tracking the problem with Fiddler, and it says that Cache-control is set to No Cache and that pre-check and post-check tokens are meaningless. Is there a way I can resolve this Fiddler error? I am still a newbie and I can't post any code without triggering the moderation system. I am using HttpWebRequest/httpwebresponse methods.

Without code there isn't much we can do to help you.

rootjazz · Jan 7, 2016

What exactly do you mean by recaptcha v2?

There are a few recaptcha methods for inserting recaptcha to the page, depending on what you want todo with effect how to go about this

Overfl0w · Jan 8, 2016

Must be something wrong with your request/headers/cookies etc.
Best to capture the request with a real browser and try to replicate it.

Homer Simpson72 · Jan 10, 2016

I am trying to download the challenge image with street signs etc. Recaptcha V2 requires the user to click certain images.

carnage_100101 · Jan 18, 2016

Copy and paste your code here,I can barely see the screenshot.

JazzJazzy · Jan 25, 2016

You have to catch the right exception and read the error message inside of it.

Homer Simpson72 · Feb 7, 2016

Sorry about the delay. Thanks a bunch guys, a lot has been happening for me IRL. This actually might solve the problem.

"400 Bad Request" - error with Cache control with bot

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