Fix unexpected client_info error

c2cwsgiutils/client_info.py

@@ -1,6 +1,8 @@
+import logging
 import re
 from typing import Any, Callable
 
+_LOG = logging.getLogger(__name__)
 SEP_RE = re.compile(r", *")
 
 
@@ -57,16 +59,19 @@ def _handle_forwarded(environ: dict[str, str]) -> None:
         if "HTTP_" + header in environ:
             environ["HTTP_ORIGINAL_" + header] = environ.pop("HTTP_" + header)
     forwarded = SEP_RE.split(environ.pop("HTTP_FORWARDED"))[0]
-    fields = dict(tuple(f.split("=", maxsplit=1)) for f in forwarded.split(";"))
-    if "by" in fields:
-        environ["SERVER_NAME"] = fields["by"]
-    if "for" in fields:
-        environ["REMOTE_ADDR"] = fields["for"]
-    if "host" in fields:
-        environ["HTTP_ORIGINAL_HOST"] = environ["HTTP_HOST"]
-        environ["HTTP_HOST"] = fields["host"]
-    if "proto" in fields:
-        environ["wsgi.url_scheme"] = fields["proto"]
+    try:
+        fields = dict(tuple(f.split("=", maxsplit=1)) for f in forwarded.split(";"))
+        if "by" in fields:
+            environ["SERVER_NAME"] = fields["by"]
+        if "for" in fields:
+            environ["REMOTE_ADDR"] = fields["for"]
+        if "host" in fields:
+            environ["HTTP_ORIGINAL_HOST"] = environ["HTTP_HOST"]
+            environ["HTTP_HOST"] = fields["host"]
+        if "proto" in fields:
+            environ["wsgi.url_scheme"] = fields["proto"]
+    except ValueError:
+        _LOG.exception("Error parsing Forwarded header '%s'", forwarded)
 
 
 def filter_factory(*args: Any, **kwargs: Any) -> Callable[..., Any]: