Built-in way to do auto-retry for certain status codes
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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
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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