docs: add websocket docs

fix: fagongzi#87

Merge pull request fagongzi#81 from archfish/master

makefile add default target, add benchmark doc

fix: fagongzi#76 and fagongzi#77

fix: fagongzi#76 and fagongzi#77

fix: transparent proxy using incorrect response code

fix: fagongzi#72

dev: support dependencies dispatches

dev: update readme and dockerfile

dev: change base docker image