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Date: Thu, 01 Jun 2006 16:00:14 +0800
From: Paulex Yang <paulex.yang@gmail.com>
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To: harmony-dev@incubator.apache.org
Subject: Re: [jira] Commented: (HARMONY-499) Java 5 Enhancement:
 java.net.HttpURLConnection
 should send request head with a connection-field of "Keep-Alive"
References: <7124894.1149140250844.JavaMail.jira@brutus>
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Alexander Kleymenov (JIRA) wrote:
>     [ http://issues.apache.org/jira/browse/HARMONY-499?page=comments#action_12414202 ] 
>
> Alexander Kleymenov commented on HARMONY-499:
> ---------------------------------------------
>
> Hello,
>
> I am working on HttpsURLConnection and noticed this JIRA report.
>
> I went through the Java 5 Enhancements for Networking and could not found any statements for HttpURLConnection. 
>
> Then I examined the HTTP protocol specification 
> (RFC 2616 can be found at http://www.ietf.org/rfc/rfc2616.txt).
> It says:
>    "HTTP/1.1 applications that do not support persistent connections MUST
>    include the "close" connection option in every message."
>  
> The source file of HttpURLConnection implementation does not seem to support persistent connections. 
>  
> So recent changes made to the class
>
> org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnection
>
> ("Connection: close" --> "Connection: Keep-Alive") seem to be incorrect without implementation of support for persistent connections.
>   
Alexander,

Let Richard speak for himself, but I agree with you that we should 
provide the support for persistent connections, as the spec hints:

" Each HttpURLConnection instance is used to make a single request but 
the underlying network connection to the HTTP server may be 
transparently shared by other instances. Calling the close() methods on 
the InputStream or OutputStream of an HttpURLConnection after a request 
may free network resources associated with this instance but has no 
effect on any shared persistent connection. Calling the disconnect() 
method may close the underlying socket if a persistent connection is 
otherwise idle at that time."

My idea is some internal socket pool should be maintained, and this 
mechanism should can be shared between HttpURLConnection and 
HttpsURLConnection, do you have any suggestions on this issue?
> Thanks,
> Alexander
>
>   
>> Java 5 Enhancement: java.net.HttpURLConnection should send request head with a connection-field of "Keep-Alive"
>> ---------------------------------------------------------------------------------------------------------------
>>
>>          Key: HARMONY-499
>>          URL: http://issues.apache.org/jira/browse/HARMONY-499
>>      Project: Harmony
>>         Type: Improvement
>>     
>
>   
>>   Components: Classlib
>>     Reporter: Richard Liang
>>     Assignee: Tim Ellison
>>     Priority: Minor
>>  Attachments: luni.src.net.diff
>>
>> Hello,
>> java.net.HttpURLConnection should send request head with a default connection-field of "Keep-Alive". Currently in its implementation, it sends a connection-field of "close", but does not close its own socket after connection, which may cause low performance and strange behavior on some servers.
>> Best regards,
>> Richard
>>     
>
>   


-- 
Paulex Yang
China Software Development Lab
IBM


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