Unclear how to handle 429 response from CRM

[JefRouleau]

It is unclear how best to handle a 429 from CRM. The CRMWebAPIException does not give access to the status code. Even if it did, we would be missing the RetryAfter header. Ideally it would be handled by the library or at least it could be exposed. Maybe a quick fix would be to add the HTTP status code in the exception?

This is somewhat related to #86 but I'm not necessarily looking for integration with Polly.
Also, I currently don't see the retries being handled in PR #99 mentioned by the issue #86 .

[gregwinterstein]

I'm not sure it helps you much, but we use the attached modification to CRMWebAPI.cs to add the status code and the URL to the exception messages.

patch.diff.txt

[mohsinonxrm]

@JefRouleau , PR #99 has a basic version of Polly WaitAndRetry implemented. Take a look here:
https://github.com/davidyack/Xrm.Tools.CRMWebAPI/pull/99/files#diff-1bf3a747e4682ee05a1619771c4d291a27b4e56a6a049704ec0fdd2a76311deb
Look at line: 123 from CRMWebAPI.cs