51 lines
1.9 KiB
Python
51 lines
1.9 KiB
Python
#!/usr/bin/env python3
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"""Static dev server for the ATS dashboard.
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Identical to `python3 -m http.server` except it disables caching. The stdlib
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server answers conditional requests from Last-Modified, which has one-second
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granularity — so a file edited twice within the same second keeps serving the
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stale copy and the browser never sees the change.
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"""
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import os
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import sys
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from functools import partial
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from http.server import SimpleHTTPRequestHandler, ThreadingHTTPServer
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# Prefixes served by a client-side router rather than by files on disk.
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SPA_ROOTS = ("/auth/",)
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class NoCacheHandler(SimpleHTTPRequestHandler):
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def send_head(self):
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# Deep links like /auth/confirm-email?token=… are router paths, not files.
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# Hand back the SPA shell and let react-router resolve them; its assets are
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# referenced absolutely (/auth/assets/…), so nothing needs rewriting.
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for root in SPA_ROOTS:
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if self.path.startswith(root) and not os.path.exists(self.translate_path(self.path)):
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self.path = root + "index.html"
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break
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return super().send_head()
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def end_headers(self):
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self.send_header("Cache-Control", "no-store, no-cache, must-revalidate, max-age=0")
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self.send_header("Pragma", "no-cache")
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self.send_header("Expires", "0")
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super().end_headers()
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def send_header(self, keyword, value):
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# Drop the validator entirely so conditional GETs can't 304.
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if keyword.lower() == "last-modified":
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return
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super().send_header(keyword, value)
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def log_message(self, fmt, *args):
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pass
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if __name__ == "__main__":
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port = int(sys.argv[1]) if len(sys.argv) > 1 else 4173
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directory = sys.argv[2] if len(sys.argv) > 2 else "."
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handler = partial(NoCacheHandler, directory=directory)
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print(f"Serving {directory} on http://localhost:{port} (no-cache)")
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ThreadingHTTPServer(("127.0.0.1", port), handler).serve_forever()
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