204 response from backend

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1

Hi

I use Caddy as a reverse proxy with a backend that sometimes needs to return 204 No Content response codes. Our backend generates the 204 response along with a Content-Length: 0:

HTTP/1.1 204 No Content
Date: Tue, 30 Aug 2016 06:28:44 GMT
Cache-Control: no-cache
Content-Length: 0

but Caddy strips the Content-Length header:

HTTP/1.1 204 No Content
Cache-Control: no-cache
Date: Tue, 30 Aug 2016 06:28:44 GMT

Is there a way to make caddy keep the Content-Length header, or re-add it for 204 responses? (I use the latest version 0.9.1)

Thanks
Sharon

2

For what it’s worth I’ve found the source of this behaviour in Go’s http2 package, here and here (github links).

So it looks like there really wouldn’t be any way around this, or would there?

Sharon

3

@ciconia I think the code is not behaving as you say, this line starts with if clen == "" which if set to "0", then it won’t be overwritten in that conditional block.

this line starts a conditional block that could empty the variable if non-empty on entry but the condition is clen64 >= 0 and it clearly would be zero in this case.

I haven’t had time to dig into the Caddy source to see where this behaviour might stem from though…

4

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