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https://issues.apache.org/jira/browse/HTTPCLIENT-1105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alin Vasile updated HTTPCLIENT-1105:
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Attachment: patch_auto_retry.diff
Sample work for the above functionality. Most of the work is copied from the
CachingHttpClient. My environment is not fully functional, so I wasn't able to
optimize the imports. Please share your thoughts...
> Built-in way to do auto-retry for certain status codes
> ------------------------------------------------------
>
> Key: HTTPCLIENT-1105
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1105
> Project: HttpComponents HttpClient
> Issue Type: Wish
> Components: HttpClient
> Affects Versions: 4.1.1
> Reporter: Dan Checkoway
> Priority: Minor
> Fix For: Future
>
> Attachments: patch_auto_retry.diff
>
>
> The HttpRequestRetryHandler mechanism is great. It allows API users to plug
> in their own logic to control whether or not a retry should automatically be
> done, how many times it should be retried, etc. That works perfectly in
> scenarios where an exception is caught while issuing the request. It falls
> short, however, in this scenario...
> If I'm hitting a service that returns a 503, I want to be able to retry that
> request automatically as well. As of right now, I need to write my own logic
> to accomplish that, and it's clunky trying to integrate it with the
> httpClient.execute() call, since it's my ResponseHandler impl that ends up
> getting the 503. I can see use cases for auto-retrying upon getting other
> HTTP statuses as well, not just 503.
> My request here is...I would love to be able to configure, either on the
> HttpClient itself or on a wrapping class or something, that a request should
> automatically be retried if the HTTP status code is among of a set of
> statuses that I configure. It would be nice if you could set the max # of
> retries, an optional sleep time in between retries (perhaps optional
> incremental backoff if you want to get fancy). I'm not sure if this is
> possible, but it would be nice if -- when this type of status-based retry is
> enabled -- my ResponseHandler wouldn't even get invoked until retry was
> successful.
> Here's an alternative suggestion, possibly simpler to build, but definitely
> not as elegant:
> In my ResponseHandler, you could throw a RetryRequestException or something
> like that, and the calling code would catch that and do as expected. That
> might simplify the mechanism so to speak.
> Anyway, I would love not to have to roll my own retry code, since I suspect
> this is something that hundreds (thousands?) of HttpClient users have had to
> code. Seems like providing a standardized, well-written way to do it would
> go a long way to helping many coders out there.
> Thanks!
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