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2021-09-16 08:47:23 +0000 | commented answer | Where do I even look to find the reason for a "400 Bad Request" ? @Chuckc: Bingo! Many thanks! When I made my comparisons of proper and improper http requests even using meld, I found n |
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2021-09-16 07:25:01 +0000 | answered a question | Where do I even look to find the reason for a "400 Bad Request" ? @Chuckc: Bingo! Many thanks! When I made my comparisons of proper and improper http requests even using meld, I found n |
2021-09-16 06:55:39 +0000 | marked best answer | Where do I even look to find the reason for a "400 Bad Request" ? I had expected wireshark providing an answer, but I have reached my limit in interpreting wireshark's output and don't even know where to look further. I hope you can help. I have a device, a Geiger counter, which is programmed to issue a HTTP request on my local network to an Apache server on that same network. This server always answers with "400 Bad request". Consistent with that, Apache's error log says: "AH00566: request failed: malformed request line". Then, using wireshark, I copied the "malformed" line taken from its output, and entered this line into a browser (both Firefox and Chrome used): The server now gives a 200 response, and of course no error. So seemingly the HTTP request is proper. Why is it not when coming from the Geiger counter? I am attaching the 2 lines from wireshark, the request and the response, fully expanded, hoping that this contains the things I need to look out for. If more/other data are needed, please tell me! Also, I have now added the mod_log_forensic module to my Apache server. This is supposed to give me all header info before and after processing them. The bummer is, it gives me all header info when the request succeeds, but none whatsoever when it fails as in my cases with "malformed requests". I don't see any options to set for this module :-(( I am confident the answer is in wireshark, but where do I even look? (Sorry, I am not allowed to attach a file, so I resort to putting the lines here as text) (more) |
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2021-09-15 12:04:03 +0000 | asked a question | Where do I even look to find the reason for a "400 Bad Request" ? Where do I even look to find the reason for a "400 Bad Request" ? I had expected wireshark providing an answer, but I ha |