Hello,
I have been facing issues with the HttpClient around resiliency to server-side
failures. My intention is that if my Http request isn't satisfied in some
small amount of time (say 600ms), then HttpClient should give up.
I thought that I was achieving this by setting connectionTimeout in the
RequestConfig. Today we ran into a situation where we blocked indefinitely in
httpClient. I finally killed the server it was connecting to, and my
HttpClient requesting code (below) finally throws an IOException.
Our logging was empty until I killed the remote server. Once it was down, the
client logged:
10:36:15.712 [ServiceRunnerThread] INFO o.a.http.impl.execchain.RetryExec -
I/O exception (org.apache.http.NoHttpResponseException) caught when processing
request to {}->http://remotehost:8888<http://remotehost:8888/>: The target
server failed to respond
10:36:15.713 [ServiceRunnerThread] INFO o.a.http.impl.execchain.RetryExec -
Retrying request to {}->http://remotehost:8888<http://remotehost:8888/>
10:36:15.768 [ServiceRunnerThread] ERROR c.i.g.s.b.o.m.DataService - Exception
while attempting to connect to Remote Gateway:
org.apache.http.conn.HttpHostConnectException: Connect to remote host:8888
[remotehost/10.1.1.1] failed: Connection refused
Here is my request logic. I am using httpclient-4.3.3:
final HttpGet myRequest = new HttpGet(aUri);
try {
RequestConfig myRequestConfig =
RequestConfig.custom().setConnectTimeout(CONNECTION_TIMEOUT).build();
CloseableHttpClient myClient = HttpClientBuilder.create()
.setDefaultRequestConfig(myRequestConfig)
.build();
final HttpResponse myResponse = myClient.execute(myRequest);
final HttpEntity myEntity = myResponse.getEntity();
if (myEntity == null) {
return null;
}
final String myContent = EntityUtils.toString(myEntity);
if (ok(myResponse)) {
return theObjectMapper.readValue(myContent, aClass);
} else {
LOGGER.error("{}", myContent);
return null;
}
} finally {
myRequest.releaseConnection();
}
I am hoping this is a simple oversight in my construction of the HttpClient.
Any and all ideas/suggestions is greatly appreciated!
-Rob
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