gock
HTTP traffic mocking and testing made easy in Go
...Built-in helpers for easy JSON/XML mocking. Supports persistent and volatile TTL-limited mocks. Full regular expressions capable HTTP request mock matching. Designed for both testing and runtime scenarios. Match request by method, URL params, headers and bodies. Extensible and pluggable HTTP matching rules. Ability to switch between mock and real networking modes. Ability to filter/map HTTP requests for accurate mock matching. Supports map and filters to handle mocks easily. Wide compatible HTTP interceptor using http.RoundTripper interface. ...