Haskell web service that redirects all traffic from HTTP to HTTPS
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This Haskell application (& resulting 7MB Docker image) is a minimalist web-server for the single purpose of redirecting to HTTPS. The easiest way to run this application is to use the Docker image on Dockerhub.

docker pull fpco/rdr2tls
docker run -i -t --rm -p 8080:8080 fpco/rdr2tls

This runs the service on port 8080. Any requests HTTP requests to port 8080 get redirected to HTTPS.

% curl -v 'http://localhost:8080/remote/worker?pants=YES'
* Hostname was NOT found in DNS cache
*   Trying
* Connected to localhost ( port 8080 (#0)
> GET /remote/worker?pants=YES HTTP/1.1
> User-Agent: curl/7.38.0
> Host: localhost:8080
> Accept: */*
< HTTP/1.1 301 Moved Permanently
< Transfer-Encoding: chunked
< Date: Wed, 06 May 2015 00:31:16 GMT
* Server Warp/3.0.13 is not blacklisted
< Server: Warp/3.0.13
< Location: https://localhost/remote/worker?pants=YES
* Connection #0 to host localhost left intact

Use a different port or domain:

docker run -i -t --rm fpco/rdr2tls rdr2tls --help
docker run -i -t --rm -p 4000:4000 fpco/rdr2tls \
    rdr2tls -p 4000 -P mycatchalldomain.com/folder

This would run rdr2tls on port 4000 and redirect all traffic to https://mycatchalldomain.com/folder

Building RDR2TLS

This application is built with Haskell. It was built using GHC 7.8 & Cabal 1.20. Feel free to use other versions if you like. The basic build consists of initiating a cabal sandbox & then installing with cabal.

cabal sandbox init
cabal install
./.cabal-sandbox/bin/rdr2tls --help