Update web-platform-tests to revision b9d4748d6a7f9b21bd420486955b44349aa005ea

tests/wpt/web-platform-tests/docs/writing-tests/python-handlers/index.md

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+# Python Handlers
+
+Python file handlers are Python files which the server executes in response to
+requests made to the corresponding URL. This is hooked up to a route like
+`("*", "*.py", python_file_handler)`, meaning that any .py file will be
+treated as a handler file (note that this makes it easy to write unsafe
+handlers, particularly when running the server in a web-exposed setting).
+
+The Python files must define a single function `main` with the signature::
+
+    main(request, response)
+
+The wptserver implements a number of Python APIs for controlling traffic.
+
+```eval_rst
+.. toctree::
+   :maxdepth: 1
+
+   request
+   response
+   stash
+```

tests/wpt/web-platform-tests/docs/writing-tests/python-handlers/request.md

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+```eval_rst
+.. include:: ../../../tools/wptserve/docs/request.rst
+```

tests/wpt/web-platform-tests/docs/writing-tests/python-handlers/response.md

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+```eval_rst
+.. include:: ../../../tools/wptserve/docs/response.rst
+```

tests/wpt/web-platform-tests/docs/writing-tests/python-handlers/stash.md

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+```eval_rst
+.. include:: ../../../tools/wptserve/docs/stash.rst
+```