Expose user defined proxy

[troky]

Example:

 var bootstrapper = new MyCouchClientBootstrapper {
    DbConnectionFn = connectionInfo => {
        connectionInfo.Proxy = new WebProxy("http://proxy:3128") {
            Credentials = new NetworkCredential("proxyUsername", "proxyPassword")
        };
        return new DbConnection(connectionInfo);
    }
};

var myCouchClient = new MyCouchClient("http://couchdb/database", bootstrapper);

[danielwertheim]

Thanks for the PR. Is there a using or something missing as the build fails on the build server?

Would you still want this to be in or would it be OK to just inherit DbConnection and then override CreateHttpClient - https://github.com/danielwertheim/mycouch/blob/master/source/projects/MyCouch/Net/Connection.cs#L58

I guess there should be a CreateHttpHandler that can be overridden that CreateHttpClient then would use.

Then you just use your type e.g ProxiedDbConnection in the bootstrapper.

[troky]

Sorry, missed using System.Net.

Well, one can create and override CreateHttpHandler and create ProxiedDbConnection in user code but why?
I think implementing ProxiedDbConnection or exposing Proxy property should be within library, not user code.

My patch is super simple, but I'll accept your idea if it is implemented in MyCouch .NET.