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Subject: RE: unable to find line starting with "HTTP"
Date: Wed, 2 Jun 2004 18:52:45 +0100
Message-ID: 
 <825BF35A92B3F0479CC164ECBBE9376EE3B6B6@kccxoex06.corp.kpmgconsulting.com>
Thread-Topic: unable to find line starting with "HTTP"
Thread-Index: AcRItc290fyNoC9qSpauFF1HZ0T8QgAEIBaA
From: "Kalnichevski, Oleg" <oleg.kalnichevski@bearingpoint.com>
To: "Commons HttpClient Project" <commons-httpclient-dev@jakarta.apache.org>

Juan,
Usually HttpClient reports 'unable to find line starting with "HTTP"' =
when the target server drops the connection without returning any =
response. This can happen, for instance, if the server is being under =
heavy load.=20

(1) If you have access to the target server, examine the server logs to =
see why the connection was dropped. Fixing the problem on the server =
side would be the best

(2) Another possible solution to this problem _may_ be to retry the =
request, provided that the POST methods your code is supposed to execute =
are idempotent. If the server application, however, has been designed in =
a way that it may receive a request, parse it, change the application =
state (by committing some data to the data store, for instance) and then =
simply drop the connection without giving any kind of response back to =
the client, you are in <strong>BIG</strong> trouble, as simply retrying =
the same POST method case cause data inconsistency problems. So, the =
best thing to do is to get in touch with the server guys and find out if =
it is safe to retry POST methods.

Hope this clarifies things a little

Oleg


-----Original Message-----
From: Juan Pedro L=F3pez S=E1ez [mailto:jpls@altiria.com]
Sent: Wednesday, June 02, 2004 17:18
To: commons-httpclient-dev@jakarta.apache.org
Subject: unable to find line starting with "HTTP"


Hi,

I've been searching in the archive list looking for something related to
my "unable to find line starting with HTTP".=20

There are lots of comments about it, but they all seem to be unuseful
for me.

Currently I'm using 2.0-rc3 version. My HTTP client is very simple.
Below you can see everything I do. That code is executed everytime I
need to send new data to the HTTP server.

--------------------------------------

HttpClient client=3D new HttpClient();
client.setStrictMode(true);
client.setTimeout(120000);=20
client.setConnectionTimeout(10000);=20

PostMethod post =3D new PostMethod(currentURL);
post.setRequestContentLength(XMLRequest.length());
post.setRequestBody(XMLRequest);
post.setRequestHeader("Content-type", "text/xml; charset=3DISO-8859-1");
post.addRequestHeader("Connection", "close");

String response;

try{
httpStatus =3D client.executeMethod(post);
response =3D post.getResponseBodyAsString();
}
catch (HttpException e) {
log.fatal("IOException in client.executeMethod( post )",e);
throw e;
}
catch(IOException e){=20
log.fatal("IOException in client.executeMethod( post )",e);
throw e;
}
finally {
post.releaseConnection();
}

------------------------------------------------

I'm getting the exception in the HttpClient.excetuteMethod line. The
exception happens from time to time, is not quite common but I don't
know what to do with it. =20

The exception stack trace is the following:

org.apache.commons.httpclient.HttpRecoverableException:
org.apache.commons.httpclient.HttpRecoverableException: Error in parsing
the status  line from the response: unable to find line starting with
"HTTP"
at
org.apache.commons.httpclient.HttpMethodBase.readResponse(HttpMethodBase.=
java:1965)
at
org.apache.commons.httpclient.HttpMethodBase.processRequest(HttpMethodBas=
e.java:2659)
at
org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:=
1093)
at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:67=
4)
at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:52=
9)

I would apreciate any help.

Thank you very much

Juan Pedro L=F3pez


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