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Add no-cache headers to webserver endpoints
Prevents browsers and proxies from caching stale inverter data by adding Cache-Control, Pragma, and Expires headers to all HTTP responses.
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‎SunGather/exports/webserver.py‎

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -80,23 +80,35 @@ def do_GET(self):
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if self.path.startswith('/metrics'):
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self.send_response(200)
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self.send_header("Content-type", "text/plain")
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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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self.end_headers()
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self.wfile.write(bytes(export_webserver.metrics, "utf-8"))
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elif self.path.startswith('/config'):
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self.send_response(200)
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self.send_header("Content-type", "text/html")
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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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self.end_headers()
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self.wfile.write(bytes(export_webserver.config, "utf-8"))
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parsed_data = parse_qs(urlparse(self.path).query)
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logging.info(f"{parsed_data}")
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elif self.path.startswith('/json'):
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self.send_response(200)
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self.send_header("Content-type", "application/json")
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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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self.end_headers()
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self.wfile.write(bytes(export_webserver.json, "utf-8"))
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else:
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self.send_response(200)
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self.send_header("Content-type", "text/html")
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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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self.end_headers()
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self.wfile.write(bytes("<html><head><title>SunGather</title>", "utf-8"))
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self.wfile.write(bytes("<meta charset='UTF-8'><meta http-equiv='refresh' content='15'>", "utf-8"))

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