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app.py

@@ -23,6 +23,7 @@ IDEMPOTENCY_KEY_HEADER = "Idempotency-Key"
 CONTENT_ENCODING_HEADER = "Content-Encoding"
 ACCEPT_ENCODING_HEADER = "Accept-Encoding"
 GZIP_ENCODING = "gzip"
+GZIP_MAGIC = b"\x1f\x8b"
 LOW_SIGNAL_PATTERNS = [
     re.compile(pattern, re.IGNORECASE)
     for pattern in [
@@ -120,6 +121,11 @@ def _content_encoding(value: str | None) -> str:
 def _decode_request_body(raw: bytes, content_encoding: str | None) -> tuple[bytes, bool]:
     encoding = _content_encoding(content_encoding)
     if encoding == "identity":
+        if raw.startswith(GZIP_MAGIC):
+            try:
+                return gzip.decompress(raw), True
+            except OSError as exc:
+                raise ValueError("invalid gzip request body") from exc
         return raw, False
     if encoding != GZIP_ENCODING:
         raise UnsupportedContentEncoding(