I have a client application that makes http calls to another servers
using http client library (httpclient-4.1.3.jar) . Application was
deployed to 5 servers and it was working for a while. All those 5
servers are behind load balancer and firewall in data center. This
application is a web application using Spring framework. The end point,
to where the application is making http requests, are deployed on Amazon
EC2 instances behind amazon load balancer.
Today I start experience problems:
12/05/07 10:03:48 java.net.ConnectException: Connection timed out
12/05/07 10:03:48 at java.net.PlainSocketImpl.socketConnect(Native
Method)
12/05/07 10:03:48 at
java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
12/05/07 10:03:48 at
java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
12/05/07 10:03:48 at
java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
12/05/07 10:03:48 at
java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
12/05/07 10:03:48 at java.net.Socket.connect(Socket.java:507)
12/05/07 10:03:48 at java.net.Socket.connect(Socket.java:457)
12/05/07 10:03:48 at java.net.Socket.<init>(Socket.java:365)
12/05/07 10:03:48 at java.net.Socket.<init>(Socket.java:238)
12/05/07 10:03:48 at
org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java
:79)
12/05/07 10:03:48 at
org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java
:121)
12/05/07 10:03:48 at
org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:706)
12/05/07 10:03:48 at
org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:386)
12/05/07 10:03:48 at
org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
12/05/07 10:03:48 at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
12/05/07 10:03:48 at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324)
12/05/07 10:03:48 at
org.artstor.security.acegi.ui.SamlAuthenticationProcessingFilter.makeHttpsRequest(SamlAuthenticationProcessingFilt
er.java:377)
On receiving end, I don't see any log in Apache access logs.
If I do curl to the same URL, It works fine. Nobody changed any
configuration or anything like that.
How can I drill down and debug the issue? It makes more complicated
because it is on production server but this functionality is not
released yet.
Any ideas?
httpclient-4.1.3.jar
httpclient-cache-4.1.3.jar
httpcore-4.1.4.jar
httpmime-4.1.3.jar
Our code:
public byte[] makeHttpsRequest(String url) {
byte[] responseBody = null;
HttpClient httpClient=new HttpClient();
HttpMethod method = new GetMethod(url);
HttpMethodRetryHandler myretryhandler = new
HttpMethodRetryHandler() {
public boolean retryMethod(
final HttpMethod method,
final IOException exception,
int executionCount) {
if (executionCount >= 3) {
// Do not retry if over max retry count
return false;
}
if (exception instanceof NoHttpResponseException) {
// Retry if the server dropped connection on us
return true;
}
if (exception instanceof IOException) {
// Retry if read timeout happens
return true;
}
if (!method.isRequestSent()) {
// Retry if the request has not been sent fully or
// if it's OK to retry methods that have been sent
return true;
}
// otherwise do not retry
return false;
}
};
// Provide custom retry handler is necessary
method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,myretryhandler);
try {
HttpClientParams param=new HttpClientParams();
param.setSoTimeout(3000);
httpClient.setParams(param);
method.addRequestHeader("Accept",
"text/html,application/xhtml+xml,application/xml,application/json");
// Provide custom retry handler is necessary
method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
new DefaultHttpMethodRetryHandler(3, false));
int statusCode = httpClient.executeMethod(method);
if (statusCode != HttpStatus.SC_OK) {
System.err.println("Method failed: " +
method.getStatusLine());
}
responseBody = method.getResponseBody();
} catch (SocketTimeoutException e) {
System.err.println("can't connect to shibboleth server: "
+ e.getMessage());
e.printStackTrace();
} catch (IOException e) {
System.err.println("can't connect to shibboleth server: "
+ e.getMessage());
e.printStackTrace();
} finally {
// When HttpClient instance is no longer needed,
// shut down the connection manager to ensure
// immediate deallocation of all system resources
method.releaseConnection();
}
return responseBody;
}
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