Issues with setting artifact properties

[briantist]

Because we previously relied on the collection being uploaded first before we gathered the collection info, we always updated the properties after uploading. It turns out this requires a pro license: https://www.jfrog.com/confluence/display/JFROG/Artifactory+REST+API#ArtifactoryRESTAPI-SetItemProperties

In #5 , since we removed that requirement, I attempted to use matrix parameters to set the artifact properties on upload, in a single request. Not having integration tests working yet, I usually test this against an older test version of Artifactory I have around that's still licensed, and this failed for the collection_info property which is JSON (Artifactory returned a 400 Bad Request error).

Testing revealed that this was due to quote characters (" and '), and no manner of escaping seemed to help, so I kept the post-upload property setting.

As I work on implementing integration tests with Artifactory OSS, I discovered the Pro license requirement, but I also discovered that the matrix property method has no issues with the JSON property or quote characters in general 🤯

I cannot find any documented acknowledgement of the problem in the 6.x series, nor a documented fix in the 7.x series; further testing has confirmed that even with OSS container 6.x (same version as my test environment) the issue is not present.

Further digging reveals that the issue likely related to some kind of reverse proxy arrangement in my environment, but I've seen some evidence that this might be due to the "default" reverse proxy configurations generated by Artifactory itself, so I am likely not the only person to be affected, and the most likely environments to be affected are in production (where it's more likely that reverse proxies are used). Some more info:

• Deployment fails with last commit has an ASCII quote in the first line (summary) jfrog/jenkins-artifactory-plugin#618
• https://www.jfrog.com/jira/browse/RTFACT-26841