Moves ignored_headers to constants and reformatted anthropic.py

proxy/utils/constants.py

@@ -0,0 +1,13 @@
+"""Common constants used in the proxy."""
+
+IGNORED_HEADERS = [
+    "accept-encoding",
+    "host",
+    "invariant-authorization",
+    "x-forwarded-for",
+    "x-forwarded-host",
+    "x-forwarded-port",
+    "x-forwarded-proto",
+    "x-forwarded-server",
+    "x-real-ip",
+]