Extend http proxy to support urls with a duplicated parameter with different values

[josegar74]

Currently the http proxy doesn't support to send a parameter repeated in the url with different values. This causes Kibana when proxied to fail some requests like the following :

http://localhost:8080/geonetwork/dashboards/api/index_patterns/_fields_for_wildcard?pattern=gn-records&meta_fields=_source&meta_fields=_id&meta_fields=_type&meta_fields=_index&meta_fields=_score

The original code relies in org.mitre.dsmiley.httpproxy.URITemplateProxyServlet.service method, that used a list of parameters. This change uses a map with a list of values instead.

It should be check to send a pull to https://github.com/mitre/HTTP-Proxy-Servlet to apply the changes in org.mitre.dsmiley.httpproxy.URITemplateProxyServlet.service. But this can take a while until merged and released in HTTP-Proxy-Servlet project.

Checklist

• I have read the [contribution guidelines](https://github.com/geonetwork/core-geonetwork/blob/main/CONTRIBUTING.md
• Pull request provided for main branch, backports managed with label
• Good housekeeping of code, cleaning up comments, tests, and documentation
• Clean commit history broken into understandable chucks, avoiding big commits with hundreds of files, cautious of reformatting and whitespace changes
• Clean commit messages, longer verbose messages are encouraged
• API Changes are identified in commit messages
• Testing provided for features or enhancements using automatic tests)
• User documentation provided for new features or enhancements in mannual
• Build documentation provided for development instructions in README.md files
• Library management using pom.xml dependency management. Update build documentation with intended library use and library tutorials or documentation

[juanluisrp]

Added a PR with the change to the proxy library mitre/HTTP-Proxy-Servlet#243.

[juanluisrp]

LGTM.

[geonetworkbuild]

The backport to 4.2.x failed:

The process '/usr/bin/git' failed with exit code 1

stderr

error: could not apply 7198ba760b... Extend proxy to manage duplicated parameters
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

stdout

Auto-merging web/src/main/java/org/fao/geonet/proxy/URITemplateProxyServlet.java
CONFLICT (content): Merge conflict in web/src/main/java/org/fao/geonet/proxy/URITemplateProxyServlet.java

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-4.2.x 4.2.x
# Navigate to the new working tree
cd .worktrees/backport-4.2.x
# Create a new branch
git switch --create backport-7456-to-4.2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 7198ba760b8aab44d1c2141b2e707bc464c73f7f
# Push it to GitHub
git push --set-upstream origin backport-7456-to-4.2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-4.2.x

Then, create a pull request where the base branch is 4.2.x and the compare/head branch is backport-7456-to-4.2.x.