[jira] Created: (HTTPCLIENT-855) DNS Multiple A Support

DNS Multiple A Support
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                 Key: HTTPCLIENT-855
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-855
             Project: HttpComponents HttpClient
          Issue Type: Question
          Components: HttpClient
    Affects Versions: 3.1 Final
         Environment: Windows
            Reporter: THIRION Yannick
            Priority: Minor


I didn't find any documentation on using DNS multiple A with httpclient.
I set up a 2 IP DNS configuration and tried to perform an HTTPS request to this DNS address.

It looks like httpclient does not try to walk through the IPs.
When the first IP connection failed due to connection refused it retryies on the first IP but didn't try to fallback to secondary IP.

Is that the expected behavious?

Note : I'm using a custom SSL  handler to support PKCS11 java keystore

Is httpclient compliant with multiple A? If yes, is there any special settings?

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     [ https://issues.apache.org/jira/browse/HTTPCLIENT-855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Oleg Kalnichevski resolved HTTPCLIENT-855.
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    Resolution: Won't Fix

HttpClient does not provide support for automatic multi-home fail-over on connect failures. A simple fail-over mechanism can be implemented using a custom socket factory such as MultihomePlainSocketFactory shipped with HttpClient 4.0.

http://hc.apache.org/httpcomponents-client/httpclient/xref/org/apache/http/conn/MultihomePlainSocketFactory.html

More complex fail-over scenarios that involve black listing of IP addresses should be implemented on top of HttpClient

Oleg

> DNS Multiple A Support
> ----------------------
>
>                 Key: HTTPCLIENT-855
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-855
>             Project: HttpComponents HttpClient
>          Issue Type: Question
>          Components: HttpClient
>    Affects Versions: 3.1 Final
>         Environment: Windows
>            Reporter: THIRION Yannick
>            Priority: Minor
>
> I didn't find any documentation on using DNS multiple A with httpclient.
> I set up a 2 IP DNS configuration and tried to perform an HTTPS request to this DNS address.
> It looks like httpclient does not try to walk through the IPs.
> When the first IP connection failed due to connection refused it retryies on the first IP but didn't try to fallback to secondary IP.
> Is that the expected behavious?
> Note : I'm using a custom SSL  handler to support PKCS11 java keystore
> Is httpclient compliant with multiple A? If yes, is there any special settings?

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