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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 

<system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime maxUrlLength="6144" 
                 relaxedUrlToFileSystemMapping="true"
                 targetFramework="4.5"/>

When I call the api with 299 characters everything works fine, but with more than 299 characters it serves up a Bad Request - Invalid URL

sample url:

http://localhost:56835/api/multibuys/10270001C1001034900|10358419P4001027620|10781772P4805004950|10781772P4805004950|10781772P4805004950|10781772P4805004950|10781772P4805004950|10781772P4805004950|10781772P4805004950|10781772P4805004950|10781772P4805004950|10781772P4805004950|10781772P4805004950|

KyleMit
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rushd
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1 Answers1

6

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

enter image description here

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.

To add via the command line use (elevated prompt)

REG ADD HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters /v UrlSegmentMaxLength /t REG_DWORD /d 32766 /f

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

wal
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