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@ -205,7 +205,7 @@ class UiRequest(object):
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if self.isWebSocketRequest():
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return self.error403("WebSocket request not allowed to load wrapper") # No websocket
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if "text/html" not in self.env["HTTP_ACCEPT"]:
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if "text/html" not in self.env.get("HTTP_ACCEPT", ""):
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return self.error403("Invalid Accept header to load wrapper")
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if "prefetch" in self.env.get("HTTP_X_MOZ", "") or "prefetch" in self.env.get("HTTP_PURPOSE", ""):
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return self.error403("Prefetch not allowed to load wrapper")
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