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i am working on an HTTP server which is supposed to only allow a certain amount of connections per user. How do I gracefully tell the user that more than n connections are not permitted. I tried answering the (n+1)th request with a 403 but apparently that kills the whole download. (At least with Down them All)

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3 Answers

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429: Too Many Requests

seems to be the one.

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up vote 2 down vote

Wikipedia lists a few possibilities:

503 Service Unavailable

The server is currently unavailable (because it is overloaded or down for maintenance).[2] Generally, this is a temporary state.

509 Bandwidth Limit Exceeded (Apache bw/limited extension)

This status code, while used by many servers, is not specified in any RFCs.

For FTP:

450 Requested file action not taken. File unavailable (e.g., file busy).

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up vote -1 down vote

10068 for FTP and 403.9 for HTTP

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Are those specific to IIS? What about Apache, et al? – Dennis Williamson Feb 9 '11 at 21:05
Those are universal FTP and HTTP status codes respectively. – Jacob Feb 9 '11 at 21:12
can you point me to any RFC where this is specified? – niklasfi Feb 9 '11 at 21:20
1  
I only see IIS mentioned with regard to decimal 403 codes. – Dennis Williamson Feb 9 '11 at 21:54
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10068 is not a valid status code in FTP. – grawity Feb 10 '11 at 6:05
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