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Subject: Re: Responding adaptively to 503 errors (including respecting the
 Retry-After header)
From: Mike Conley <mike.conley@unizin.org>
In-Reply-To: 
 <CAD77Uj7K4shdXM9gDa_mph-EtcRubdxby0EWhcvtb6i8wbbz+g@mail.gmail.com>
Date: Wed, 14 Oct 2015 17:02:05 -0400
Message-Id: <19738008-45D3-4C53-B412-F21A809C0EDA@unizin.org>
References: <EDF68B87-E34D-4021-9FAD-DADE42FDCE42@unizin.org>
 <CAD77Uj7K4shdXM9gDa_mph-EtcRubdxby0EWhcvtb6i8wbbz+g@mail.gmail.com>
To: HttpClient User Discussion <httpclient-users@hc.apache.org>

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Oh, nice! I assume this hasn=E2=80=99t been released yet, though, right? =
If it has been, the javadocs need updating :P

Glad it=E2=80=99s been handled either way. Thanks for the info.

> On Oct 14, 2015, at 4:59 PM, Stefan Magnus Landr=C3=B8 =
<stefan.landro@gmail.com> wrote:
>=20
> Newer versions handle the retry-after header:
> =
https://github.com/apache/httpclient/blob/trunk/httpclient/src/main/java/o=
rg/apache/http/client/ServiceUnavailableRetryStrategy.java
>=20
> Have a look at the default impl:
>=20
> =
https://github.com/apache/httpclient/blob/trunk/httpclient/src/main/java/o=
rg/apache/http/impl/client/DefaultServiceUnavailableRetryStrategy.java
>=20
> 2015-10-14 22:49 GMT+02:00 Mike Conley <mike.conley@unizin.org>:
>=20
>> Hi.
>>=20
>> I=E2=80=99m writing an OAI harvester (it=E2=80=99s an obscure =
protocol you=E2=80=99ve probably
>> never heard of for the exchange of metadata with content =
repositories). The
>> implementation guidelines mention 503 handling:
>> =
http://www.openarchives.org/OAI/2.0/guidelines-harvester.htm#FlowControl.
>> In particular, the suggestion is to respect the Retry-After header if
>> present.
>>=20
>> When last I did this, I had to implement it myself, but I see that
>> HttpClient 4 has 503 handling built in.
>>=20
>>=20
>> =
http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apach=
e/http/client/ServiceUnavailableRetryStrategy.html
>>=20
>> But I=E2=80=99m not sure how to use this if the retry interval should =
vary
>> per-response. getRetryInterval takes no arguments, and in particular =
has no
>> access to the HttpResponse, so I=E2=80=99m not sure how I could go =
about using
>> this. I had considered storing something when the call to =
retryRequest is
>> made, but I=E2=80=99m not sure this is safe to do (it seems likely =
that it is not,
>> since the strategy is almost certainly shared among multiple =
threads). It
>> also seems kind of kludgy to me. Is there a way to do this cleanly? =
If not,
>> is there a thread safe way to keep this state around between calls to =
the
>> two methods?
>>=20
>>=20
>=20
>=20
> --
> BEKK Open
> http://open.bekk.no
>=20
> TesTcl - a unit test framework for iRules
> http://testcl.com


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