Ability to support retries

[sukrit007wawa]

Issue
We are injecting aws-sigv4-proxy for services like AMP to add sigv4 headers. However, a lot of these services run into throttling issues and the client does not understand the "Throttling Exceptions" . It would be nice to have retry mechanism support in aws-sigv4-proxy when we run into throttling issues.

[alvinlin123]

Hi, thank you for your suggestion.

aws-sigv4-proxy is meant to be a very simply proxy that signs HTTP requests; hence, the retry logic should be the responsibility of the caller to aws-sigv4-proxy.