This is my first posting to this list although I've been a subscriber for a while now. Anyway, I've been using HTTP client for some time and although it works it also fails too often and I don't know why.
I'm using HTTP Client version 2.0 final downloaded a few months back. I'm running on Sun JRE 1.4.2_03 on Win2000.
The task at hand is the following: I'm posting xml to a servlet on a IBM server. The server sends me xml back. The serlvet is protected by username/password and the connection is SSL. I have to parse the returned xml and read a special tag value to see if there is more data available. If there is then I have to establish a new connection and receive the next batch of xml data. This goes on until all data is returned at which point I send a receipt. The trouble I'm having is that the connection sometimes fails between batches and I have been getting a few different error messages.
Here's my code, does this look ok?
In the class constructor:
client = new HttpClient(); // used for every call to connect()In the class connect() method:
logger.info("Making remote connection");
client.setStrictMode(false); logger.debug("Setting username/password credentials");
UsernamePasswordCredentials upc =
new UsernamePasswordCredentials(username, password);
HttpState httpState = client.getState();
httpState.setCredentials(realm, host, upc); logger.debug("Making connection method object");
HttpMethodBase method = requester.createHttpMethod(url);
method.setDoAuthentication(true); logger.debug("Using DefaultMethodRetryHandler");
DefaultMethodRetryHandler methodRetryHandler =
new DefaultMethodRetryHandler();
method.setMethodRetryHandler(methodRetryHandler);
logger.debug("Method Retry count is " +
methodRetryHandler.getRetryCount());logger.debug("Attempting to connect");
final int LIMIT = 3;
try {
for (int i=0; i<LIMIT; i++) {
try {
status = client.executeMethod(method);
logger.info("Executed!");
break;
} catch (HttpRecoverableException e) {
logger.error("Http exception", e);
} catch (IOException e) {
logger.fatal("IOException", e);
}
}
} finally {
byte[] body = method.getResponseBody();
String charset = method.getRequestCharSet();
method.releaseConnection(); processContent(body, charset);
} printRequestHeaders(method);
printResponseHeaders(method);
printCookieInfo(client.getState());
} catch (...)Does this look ok? It seems to work fine when executeMethod() succeeds, but when it fails there seems to be no way back.
Ok. From the wire trace it seems this is happening:
- I initiate a post to the server - The server responds saying not authorized with a realm value - HTTP Client then resends the post using the credentitals I have supplied (why doesn't it do this the first time?) - The server responds with the result - HTTP Client can't read the result because it can't find a line starting with HTTP.
The error I'm getting is this case is
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(HttpMethodBase.java:2659)
at org.apache.commons.httpclient.HttpMethodBase.execute(HttpMethodBase.java:1093)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:675)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:529)
When I look at the wire trace it says:
DEBUG [main] httpclient.wire - >> "POST /sting/StingServlet HTTP/1.1[\r][\n]"
DEBUG [main] httpclient.wire - >> "User-Agent: Jakarta Commons-HttpClient/2.0final[\r][\n]"
DEBUG [main] httpclient.wire - >> "Host: e-torg.no.ihost.com[\r][\n]"
DEBUG [main] httpclient.wire - >> "Content-Length: 816[\r][\n]"
DEBUG [main] httpclient.wire - >> "Content-Type: application/x-www-form-urlencoded[\r][\n]"
DEBUG [main] httpclient.wire - >> "[\r][\n]"
DEBUG [main] httpclient.wire - >> "xmlInput=%3C%3Fxml+version%3D%22[stuffdeleted]3E%0A%3C%2FstingRequest%3E%0A"
DEBUG [main] httpclient.wire - << "HTTP/1.1 401 Unauthorized [\r][\n]"
DEBUG [main] httpclient.wire - << "Server: IBM HTTP Server/V5R3M0[\r][\n]"
DEBUG [main] httpclient.wire - << "Date: Fri, 14 May 2004 11:18:33 GMT[\r][\n]"
DEBUG [main] httpclient.wire - << "Accept-Ranges: bytes[\r][\n]"
DEBUG [main] httpclient.wire - << "Content-Type: text/html; charset=IBM-1047[\r][\n]"
DEBUG [main] httpclient.wire - << "Content-Length: 282[\r][\n]"
DEBUG [main] httpclient.wire - << "Last-Modified: Fri, 14 May 2004 11:18:33 GMT[\r][\n]"
DEBUG [main] httpclient.wire - << "Expires: Fri, 14 May 2004 11:18:33 GMT[\r][\n]"
DEBUG [main] httpclient.wire - << "Pragma: no-cache[\r][\n]"
DEBUG [main] httpclient.wire - << "Cache-Control: no-cache[\r][\n]"
DEBUG [main] httpclient.wire - << "WWW-Authenticate: Basic realm="STING_Restricted"[\r][\n]"
DEBUG [main] httpclient.wire - << "IMW0254E <HTML><HEAD><TITLE>Error</TITLE></HEAD><BODY bgcolor="[0xfffd][0xfffd]FFF7E7"><H1>Error 401</H1>IMW0216E Not authorized. Authentication failed.<P><HR><ADDRESS><A HREF="https://e-torg.no.ihost.com/"; target="_top">IBM HTTP Server - North American Edition V5R3M0</A></ADDRESS></BODY></HTML"
DEBUG [main] httpclient.wire - >> "POST /sting/StingServlet HTTP/1.1[\r][\n]"
DEBUG [main] httpclient.wire - >> "User-Agent: Jakarta Commons-HttpClient/2.0final[\r][\n]"
DEBUG [main] httpclient.wire - >> "Host: e-torg.no.ihost.com[\r][\n]"
DEBUG [main] httpclient.wire - >> "Content-Length: 816[\r][\n]"
DEBUG [main] httpclient.wire - >> "Content-Type: application/x-www-form-urlencoded[\r][\n]"
DEBUG [main] httpclient.wire - >> "Authorization: Basic aTAweGRrOmVqYjl3aQ==[\r][\n]"
DEBUG [main] httpclient.wire - >> "[\r][\n]"
DEBUG [main] httpclient.wire - >> "xmlInput=%3C%3Fxml+version%3D%22[stuffdeleted]3E%0A%3C%2FstingRequest%3E%0A"
DEBUG [main] httpclient.wire - << ">HTTP/1.1 200 ok [\r][\n]"
DEBUG [main] httpclient.wire - << "Server: IBM HTTP Server/V5R3M0[\r][\n]"
DEBUG [main] httpclient.wire - << "Date: Fri, 14 May 2004 11:18:35 GMT[\r][\n]"
DEBUG [main] httpclient.wire - << "Accept-Ranges: bytes[\r][\n]"
DEBUG [main] httpclient.wire - << "Transfer-Encoding: chunked[\r][\n]"
DEBUG [main] httpclient.wire - << "Content-Type: text/xml[\r][\n]"
DEBUG [main] httpclient.wire - << "Last-Modified: Fri, 14 May 2004 11:18:35 GMT[\r][\n]"
DEBUG [main] httpclient.wire - << "Expires: Thu, 01 Dec 1994 16:00:00 GMT[\r][\n]"
DEBUG [main] httpclient.wire - << "Set-Cookie: sesessionid=9Br13dKU6vHMOp6QVZGKGuJi;Path=/[\r][\n]"
DEBUG [main] httpclient.wire - << "Cache-Control: no-cache="set-cookie,set-cookie2"[\r][\n]"
DEBUG [main] httpclient.wire - << "[\r][\n]"
DEBUG [main] httpclient.wire - << "148E[\r][\n]"
DEBUG [main] httpclient.wire - << "<?xml version="1.0" encoding="UTF-8"?>[\r][\n]"
[xml contents from server follow]
Notice the funny ">" character before the second server response: "> HTTP/1.1 200 ok". This seems to be part of a HTML response from the first response further up the wire trace:
4000 [main] DEBUG httpclient.wire - << "IMW0254E <HTML><HEAD><TITLE>Error</TITLE></HEAD><BODY bgcolor="[0xfffd][0xfffd]FFF7E7"><H1>Error 401</H1>IMW0216E Not authorized. Authentication failed.<P><HR><ADDRESS><A HREF="https://e-torg.no.ihost.com/"; target="_top">IBM HTTP Server - North American Edition V5R3M0</A></ADDRESS></BODY></HTML"
Notice there is no closing ">" character and this seems to be the cause of this particular problem.
Most of the code in this wire trace is done automatically by HTTP Client.
Why is this happening? Can anyone help?
Best regards Lee Francis Wilhelmsen
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