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Title: gh-135056: Add a --header CLI argument to http.server by aisipos · Pull Request #135057 · python/cpython · GitHub

Open Graph Title: gh-135056: Add a --header CLI argument to http.server by aisipos · Pull Request #135057 · python/cpython

X Title: gh-135056: Add a --header CLI argument to http.server by aisipos · Pull Request #135057 · python/cpython

Description: As proposed in #135056, Add a --cors command line argument to the stdlib http.server module, which will add an Access-Control-Allow-Origin: * header to all responses. Invocation: python -m http.server --cors As part of this implementation, add a response_headers argument to SimpleHTTPRequestHandler and HTTPServer, which allows callers to add addition headers to the response. Ideally it would have been possible to just have made a CorsHttpServer class, but a couple of issues made that difficult: The http.server CLI uses more than one HTTP Server class, in order to support TLS/HTTPS. So a single CorsHttpServer child class wouldn't work to support both use cases. Much of the work in specifying HTTP behavior is handled by the various RequestHandler classes. However, the HttpServer classes didn't have an easy way to pass arguments down into the instantiated handlers. As a result, this PR updates both HTTPServer and SimpleHTTPRequestHandler to accept a response_headers argument, which allows callers to specify an additional set of HTTP headers to pass in the response. HTTPServer now overrides finish_request to pass this new kwarg down to its RequestHandler. SimpleHTTPRequestHandler now accepts a resposnse_headers kwarg, to optionally specify a dictionary of additional headers to send in the response. Care is taken to not pass the response_headers argument to any instance constructors when not provided, to ensure backwards compatibility. I tried to keep the implementation as short and simple as possible. With the addition of a response_headers argument, we allow ourselves to have a future possible custom header http argument, such as: python -m http.server -H 'custom-header: custom-value' Issue: gh-135056 📚 Documentation preview 📚: https://cpython-previews--135057.org.readthedocs.build/

Open Graph Description: As proposed in #135056, Add a --cors command line argument to the stdlib http.server module, which will add an Access-Control-Allow-Origin: * header to all responses. Invocation: python -m http.ser...

X Description: As proposed in #135056, Add a --cors command line argument to the stdlib http.server module, which will add an Access-Control-Allow-Origin: * header to all responses. Invocation: python -m http.ser...

Opengraph URL: https://github.com/python/cpython/pull/135057

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