Bug 1608901 - Add referer to http headers when querying ActiveData from test-info; r=egao

Simply add referer to ActiveData queries.

Differential Revision: https://phabricator.services.mozilla.com/D59779

--HG--
extra : moz-landing-system : lando

Author: gbrownmozilla

testing/testinfo.py

@@ -23,6 +23,7 @@
 ACTIVEDATA_RECORD_LIMIT = 10000
 MAX_ACTIVEDATA_CONCURRENCY = 5
 MAX_ACTIVEDATA_RETRIES = 5
+REFERER = 'https://wiki.developer.mozilla.org/en-US/docs/Mozilla/Test-Info'
 
 
 class TestInfo(object):
@@ -45,6 +46,7 @@ def activedata_query(self, query):
         self.log_verbose(json.dumps(query))
         response = requests.post("http://activedata.allizom.org/query",
                                  data=json.dumps(query),
+                                 headers={'referer': REFERER},
                                  stream=True)
         end_time = datetime.datetime.now()
         self.total_activedata_seconds += (end_time - start_time).total_seconds()