Sometimes sends null bytes in message content

[timabbott]

We've been getting some exceptions in production in the send_message code path of this form:

ValueError: A string literal cannot contain NUL (0x00) characters.

I'm going to fix this in the server to be a 400 type error, since it's an invalid request from the client, not a 500, but these are definitely being sent by the mobile app.

I'm not sure how the app generates a message body that contains null characters; if adding logging on the server side would be useful, that's doable (it's possible these are effectively empty messages).

[borisyankov]

I will try to figure out it out.
Having the user-agent string would be useful though to detect platform and version.
We haven't fixed any issue like this, so likely this exists in the latest version too.

[timabbott]

Yeah, the part of the error email reporting that would have the app version are currently broken, so I can't get that, but we'll get it if it keeps happening after we fix that.