Merge pull request #28 from instana/http_prefix

Fix Instana context HTTP headers prefix

Author: pglombardo

instana/http_propagator.py

@@ -3,7 +3,7 @@
 from basictracer.context import SpanContext
 from instana import util, log
 
-prefix_tracer_state = 'HTTP_X_INSTANA_'
+prefix_tracer_state = 'X-Instana-'
 field_name_trace_id = prefix_tracer_state + 'T'
 field_name_span_id = prefix_tracer_state + 'S'
 field_count = 2