cherrypy-cors

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How to set up CORS in CherryPy

QUESTION

How to set up CORS in CherryPy

Asked 2019-Aug-26 at 07:25

Overview

When creating a post request from my website to my Python server running CherryPy, I receive the error Access to XMLHttpRequest has been blocked by CORS policy: Request header field content-type is not allowed by Access-Control-Allow-Headers in preflight response. . I was able to get away with the problem temporarily with one of the "CORS Everywhere" browser extensions, but

Due to recent updates, the extensions have not yet been updated to be working again.
The website involved needs to eventually be used by many in my local complex without the browser extension, so once the extensions get updated, it does not really matter one way or another, as I cannot rely on these extensions, and force everyone to use them (when there is obviously a fix that would make an extension not necessary). I figure that perhaps the solutions are outdated, but am not sure.

Here is the relevant code:

On the server side (CherryPy/Python):

The CherryPy Python function being called, from the website post request

...

ANSWER

Answered 2019-Aug-26 at 07:25

So first, you need to set pre-flight headers when processing OPTIONS request, you can list allowed methods there. Then, you also need to enable the cors.expose tool.

There's some usage hints in the docstring of cherrypy-cors. For example, when using a MethodDispatcher, you could just decorate an OPTIONS handler method with @cherrypy_cors.tools.preflight() instead of doing this in every HTTP handler.

Here's a simple traversal example (without a method dispatcher). To test it, visit http://127.0.0.1/ and it will make requests against http://localhost:3333/add_meeting which is a different Origin in terms of CORS ('localhost' != '127.0.0.1').

Source https://stackoverflow.com/questions/57416237

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