Removes request/response connection/hop headers for call resource in similar
manner as Go's reverse proxy functions. Also removes Prometheus datasource
custom call resource header manipulation in regards to hop-by-hop headers.
Fixes#60076
Ref #58646
Co-authored-by: Will Browne <wbrowne@users.noreply.github.com>
* Revert "Revert "Prometheus: Type and flavor configuration (#56496)" (#57552)"
This reverts commit 2432ce619a.
* Adds new fields and documentation for Prometheus datasource configuration: prometheus type, and version
* Adding two new fields to the data JSON in the prometheus datasource configuration: prometheusType, and prometheusVersion.
* Version field will attempt to auto-detect via buildinfo API when prometheus Type is selected
* pass on all headers except for accept headers
* touch up and testing
* add custom header values to resource queries
* remove my picture. oops
* handle gzip responses as well
* fix linting issues
* add my space
* no lint
* removed cookies from being proxied
* clean up and handle errors from io.reader.Close() calls
* Sent resource calls for metadata to the backend
* moved resource calls to the backend
* code review feedback
* fixed post with body
* statuscode >= 300
* cleanup
* fixed tests
* fixed datasource tests
* code review feedback
* force some other endpoints to only GET
* fix linting errors
* fixed tests
* was able to remove section of redundant code
* cleanup and code review feedback
* moved query_exemplars to get request
* fixed return on error
* went back to resource calls, but using the backendsrv directly
* moved to a resource call with fallback
* fixed tests
* check for proper messages
* proper check for invalid calls
* code review changes
