[erlang-questions] avoiding duplicate headers in cowboy

[Geoff Cant]

Hi there, I’m sure you’re probably well along with your own code, but you may be interested in similar work. Heroku recently released Vegur - https://github.com/heroku/vegur which is the HTTP/1.1 proxy library built on top of cowboy/ranch and used at scale there. Fred and I both haunt this list if you have questions about it. (It may be overkill, but if you need a lot of spec compliance or are doing large scale proxying it is designed for those things)

Cheers,
-Geoff

> On 1 Dec, 2015, at 10:38, Garry Hodgson <garry@REDACTED> wrote:
> 
> I've got an application where I'm using cowboy to build what is,
> in effect, a web proxy. It accepts http/s requests, makes some
> decisions about whether and where to forward, then makes its
> own request of the final endpoint and returns results. it was
> originally written in webmachine and then ported to cowboy.
> 
> everything works fine, but for one small nit. it appears that
> cowboy automagically adds its own headers to the returned
> results, which causes duplicate headers for server, content-type,
> and content-length, as seen below.
> 
> is there some way to avoid this?
> 
> $ curl -X GET http://localhost:8080/v0/log/logs?maxrecords=1 -k -H "$Creds"  -v
> * About to connect() to localhost port 8080 (#0)
> *   Trying 127.0.0.1... connected
> * Connected to localhost (127.0.0.1) port 8080 (#0)
> > GET /v0/log/logs?maxrecords=1 HTTP/1.1
> > User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> > Host: localhost:8080
> > Accept: */*
> > Authorization:  Bearer bc18fb0f-4b1f-493e-823c-fbefa0383e91
> >
> < HTTP/1.1 200 OK
> < connection: keep-alive
> < server: Cowboy
> < date: Tue, 01 Dec 2015 17:34:29 GMT
> < content-length: 71
> < content-type: application/json
> < connection: Keep-Alive
> < date: Tue, 01 Dec 2015 17:34:30 GMT
> < server: AT&T SECWEB 2.1.0
> < content-length: 71
> < content-type: application/json
> < x-powered-by: PHP/5.4.28
> < keep-alive: timeout=5, max=100
> <
> * Connection #0 to host localhost left intact
> * Closing connection #0
> {"error":"Not found","error_description":"Could not read token in CTS"}
> 
> -- 
> Garry Hodgson
> Lead Member of Technical Staff
> AT&T Chief Security Office (CSO)
> 
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