405 Client Error: METHOD NOT ALLOWED when api endpoint redirects

[jonblack]

When an api request is made to xssp/api/create/pdb_id/hssp_hssp (without trailing slash) the endpoint redirects to xssp/api/create/pdb_id/hssp_hssp/ with trailing slash. This is correct behaviour except that the redirect changes the request from a POST to a GET, resulting in a 405 Client Error: METHOD NOT ALLOWED

[cbaakman]

When I try the same using python requests, I get 500 instead of 405. The logs give no output though.

[cbaakman]

Adding the following bit of code to xssp_api/frontend/api/endpoints.py makes both work:

@bp.route('/create/<input_type>/<output_type>', methods=['POST'])
def create_xssp_no_slash(input_type, output_type):
    return create_xssp(input_type, output_type)

[jonblack]

This is not the correct solution. A route with a trailing slash redirects to the route without the trailing slash. The problem is that this (in 2014) changed the request from a POST to a GET. I suspect it was a bug and is probably fixed in a new version of flask, but before upgrading, I want to reproduce it.

The 500 error is very likely unrelated. Can you first determine what the cause of the 500 error is, please?

[cbaakman]

I see just the 500 error in the client. Nothing else. No log output from either flask or xssp_api.

[jonblack]

Try and trace the cause. Something is causing the 500 error. You can add logging statements, for example.

[cbaakman]

I think the error occurs somewhere in flask. Setting DEBUG=True however, doesn't add any log messages either.