feat(openid-connect): allow set headers in introspection request (#11… #187

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	26m 23s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	27m 56s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	23m 53s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	23m 39s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	26m 26s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	27m 35s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	24m 22s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	24m 36s
	3h 24m 50s

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