Support custom http headers
Use httptest server when testing http_listen_input
http_listen_input: test custom header support
Test custom headers with dashboard output
Update CHANGES.txt with custom header support
Replace request with response in docs.
Make starterFuncs struct fields
Set starters funcs in Init()
Merge pull request #1029 from ecnahc515/http_custom_headers

Allow custom http headers in HttpListenInput and DashboardOutput