uwsgi invalid request block size

The correct solution is not to switch to HTTP protocol. You just need to increase the buffer size in uWSGI settings.

buffer-size=32768

or in commandline mode:

-b 32768

Quote from official documentation:

By default uWSGI allocates a very small buffer (4096 bytes) for the headers of each request. If you start receiving “invalid request block size” in your logs, it could mean you need a bigger buffer. Increase it (up to 65535) with the buffer-size option.

If you receive ‘21573’ as the request block size in your logs, it could mean you are using the HTTP protocol to speak with an instance speaking the uwsgi protocol. Don’t do this.

From here: https://uwsgi-docs.readthedocs.io/en/latest/ThingsToKnow.html

I could fix it adding --protocol=http to the uwsgi.

I aslo ran into same issue while following some tutorial. The problem was that I set the option socket = 0.0.0.0:8000 instead of http = 0.0.0.0:8000. socket option intended to be used with some third-party router (nginx for instance), while when http option is set uwsgi can accept incoming HTTP requests and route them by itself.