Bad Request - Invalid URL web api

Question

I am working on a web-api and I have set the web config file to accept 6144 as the max length of the url as below

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Answer 1

I've had the same issue when self hosting web-api. I would guess the limit you are hitting is the UrlSegmentMaxLength default from Http.sys.

To fix this you need to add a new registry DWORD under

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters

called UrlSegmentMaxLength and give this the value you desire:

UrlSegmentMaxLength 260 0 - 32,766 chars Maximum number of characters in a URL path segment (the area between the slashes in the URL). If zero, it is the length that is bounded by the maximum value of a ULONG.

References:
https://serverfault.com/questions/66410/iis-6-on-x64-and-long-urls
http://support.microsoft.com/kb/820129