What this PR does / why we need it:
support customized UA to identify traffic or something else.
Which issue(s) this PR fixes(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #328
Please check the following list:
[x] Does the affected code have corresponding tests, e.g. unit test, E2E test?
[x] Does this change require a documentation update?
[ ] Does this introduce breaking changes that would require an announcement or bumping the major version?
[ ] Do all new files have an appropriate license header?
What this PR does / why we need it: support customized UA to identify traffic or something else.
Which issue(s) this PR fixes (optional, in
fixes #<issue number>(, fixes #<issue_number>, ...)format, will close the issue(s) when PR gets merged): Fixes #328Please check the following list: