[Haskell-cafe] Debugging Wreq/http-client https requests

Michael Snoyman michael at snoyman.com
Sat Nov 1 16:50:52 UTC 2014

We can certainly make this process more official/easier to use, but
http-client does support this. Manager has a field mTlsConnection which
specifies how to create a Connection value to a TLS server. Connection is a
relatively simple datatype that specifies what to do, e.g., when sending
data to a server. If you wanted to log all of that writes to a file, you
might do something like:

mOrig <- newManager tlsManagerSettings
let m = mOrig
        { mTlsConnection = \ha h p -> do
            connOrig <- mTlsConnection mOrig ha h p
            return connOrig { connectionWrite = \bs -> do
                S.appendFile "/tmp/log" bs
                connectionWrite connOrig bs

On Sat, Nov 1, 2014 at 1:16 AM, Cody Goodman <codygman.consulting at gmail.com>

> I have a program that is POST'ing some data to a remote server.
> However, some part of the data I'm sending is wrong I believe.
> If this were plain http without encryption, wireshark would allow me
> to see the exact data being sent over the wire. However, with https it
> is encrypted.
> Is there an inbuilt way to debug requests sent by wreq or more likely,
> a way to output debug info for http-client?
> Alternatively, is there a way to use NSS support with either of these
> libraries:
> http://security.stackexchange.com/questions/35639/decrypting-tls-in-wireshark-when-using-dhe-rsa-ciphersuites
> Thanks in advance to all for your time.
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