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From "Kennard Consulting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HTTPCLIENT-1048) PostMethod very slow 'out of the box' for /j_security_check
Date Fri, 28 Jan 2011 02:44:45 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12987898#action_12987898

Kennard Consulting commented on HTTPCLIENT-1048:


Thanks for your response.

I'm afraid the wire log isn't very helpful: it shows the presence/absence of the Expect header,
and shows the body being 'pulled' either during/before the request processing - pretty much
what you'd expect. But the actual cause of the 2 second slowdown is not revealed. If you try
the attached WAR you may be able to discover what is taking 2 seconds.

Anyway, if 'expect-continue' is disabled by default in 4.1, that works for me!



> PostMethod very slow 'out of the box' for /j_security_check
> -----------------------------------------------------------
>                 Key: HTTPCLIENT-1048
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1048
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>    Affects Versions: 4.0.3
>         Environment: Java 6, Tomcat 6, JBoss 5.1
>            Reporter: Kennard Consulting
>         Attachments: ExpectTest.war
> First, thanks for an awesome piece of work in HttpClient. I use it every day and it is
very useful to me.
> HttpClient's default settings include adding an...
> Expect: 100-continue
> ...header to every PostMethod. This seems to interact poorly with Tomcat's (and possibly
other Java EE containers) FormAuthenticator. I tested on both Tomcat 6 and JBoss 5.1.0 (which
I believe uses a fork of Tomcat). Testing both with/without the 'Expect' header I see '/j_security_check'
login times of:
> With Expect header: 2012ms
> Without Expect header: 8ms
> So the default is some 250x slower. This is without a database or any other complicating
factors. It can make a dramatic difference if you are using HttpClient to simulate logging
in and retrieving information.
> I include a test WAR. To deploy it:
> 1. Copy into /webapps
> 2. Edit conf/tomcat-users.xml to enable the tomcat/tomcat username/password
> 3. Run Tomcat
> 4. Hit http://localhost:8080/ExpectTest
> 5. Log in as tomcat/tomcat
> 6. Hit 'Start Test'
> The issue can be worked around by removing the RequestExpectContinue interceptor, but
it takes a lot of digging through code to realise this. Otherwise you may simply conclude
'HttpClient is slow'.
> According to the HTTP spec (http://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html#sec8.2.3),
the 100 header "allows a client that is sending a request message with a request body to determine
if the origin server is willing to accept the request (based on the request headers) before
the client sends the request body. In some cases, it might either be inappropriate or highly
inefficient for the client to send the body if the server will reject the message without
looking at the body". So perhaps this setting should only apply for 'large' POST bodies, not
for simple 'j_username=Foo&j_password=Bar' bodies?
> Regards,
> Richard

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