fix: avoid sending empty Baggage header (getsentry#1507)

intgr · sl0thentr0py · web-flow · commit bd48df2ec1f2 · 2022-07-18T20:41:30.000Z
According to W3C Working Draft spec, the Baggage header must contain at least one value, an empty value is invalid.

Co-authored-by: Neel Shah &lt;neelshah.sa@gmail.com&gt;
diff --git a/sentry_sdk/tracing.py b/sentry_sdk/tracing.py
@@ -308,7 +308,9 @@ def iter_headers(self):
             yield "tracestate", tracestate
 
         if self.containing_transaction and self.containing_transaction._baggage:
-            yield "baggage", self.containing_transaction._baggage.serialize()
+            baggage = self.containing_transaction._baggage.serialize()
+            if baggage:
+                yield "baggage", baggage
 
     @classmethod
     def from_traceparent(
