REST API. Getting error posting new message

Hey Per

I'm afraid that in this case our documentation is incorrect.

Unfortunately, the API isn't designed to carry that much content over the URL.  According to best practices, POST parameters ought to be passed via the HTTP POST body using using 'application/x-www-form-urlencoded' or 'multipart/form-data' encoding, which would require extra work on your part.

As it stands there's no way for us to increase the limit.  Apologies for being misled on this.  I'll make a request for our docs to be updated.

Regards

Noaman