Apache HttpClient Interim Error NoHttpResponseException

Question

I have a webservice which is accepting a POST method with XML  It is working fine then at some random occasion  it fails to communicate to the server throwing IOException with message The target server failed to respond  The subsequent calls work fine    It happens mostly  when i make some calls and then leave my application idle for like 10-15 min  the first call which I make after that returns this error    I tried couple of things       I setup the retry handler like  HttpRequestRetryHandler retryHandler   new HttpRequestRetryHandler                  public boolean retryRequest IOException e  int retryCount  HttpContext httpCtx                    if  retryCount  gt   3                       Logger warn CALLER   Maximum tries reached  exception would be thrown to outer block                        return false                                    if  e instanceof org apache http NoHttpResponseException                       Logger warn CALLER   No response from server on   retryCount   call                        return true                                    return false                                    httpPost getParams   setParameter HttpMethodParams RETRY HANDLER  retryHandler     but this retry never got called   yes I am using right instanceof clause   While debugging this class never being called    I even tried setting up HttpProtocolParams setUseExpectContinue httpClient getParams    false   but no use  Can someone suggest what I can do now    IMPORTANT Besides figuring out why I am getting the exception  one of the important concerns I have is why isn t the retryhandler working here

User · Answer

I have faced same issue  I resolved by adding  connection  close  as extention   Step 1  create a new class ConnectionCloseExtension  import com github tomakehurst wiremock common FileSource  import com github tomakehurst wiremock extension Parameters  import com github tomakehurst wiremock extension ResponseTransformer  import com github tomakehurst wiremock http HttpHeader  import com github tomakehurst wiremock http HttpHeaders  import com github tomakehurst wiremock http Request  import com github tomakehurst wiremock http Response   public class ConnectionCloseExtension extends ResponseTransformer      Override   public Response transform Request request  Response response  FileSource files  Parameters parameters        return Response Builder          like response           headers HttpHeaders copyOf response getHeaders                 plus new HttpHeader  Connection    Close              build            Override   public String getName         return  ConnectionCloseExtension           Step 2  set extension class in wireMockServer like below   final WireMockServer wireMockServer   new WireMockServer options                    extensions ConnectionCloseExtension class                   port httpPort

User · Answer

Nowadays  most HTTP connections are considered persistent unless declared otherwise  However  to save server ressources the connection is rarely kept open forever  the default connection timeout for many servers is rather short  for example 5 seconds for the Apache httpd 2 2 and above    The org apache http NoHttpResponseException error comes most likely from one persistent connection that was closed by the server    It s possible to set the maximum time to keep unused connections open in the Apache Http client pool  in milliseconds   With Spring Boot  one way to achieve this   public class RestTemplateCustomizers       static public class MaxConnectionTimeCustomizer implements RestTemplateCustomizer             Override         public void customize RestTemplate restTemplate                HttpClient httpClient   HttpClientBuilder                  create                    setConnectionTimeToLive 1000  TimeUnit MILLISECONDS                   build                 restTemplate setRequestFactory                  new HttpComponentsClientHttpRequestFactory httpClient                          In your service that uses a RestTemplate public MyRestService RestTemplateBuilder builder         restTemplate   builder           customizers new RestTemplateCustomizers MaxConnectionTimeCustomizer              build

User · Answer

Same problem for me on apache http client 4 5 5 adding default header  Connection  close  resolve the problem

User · Answer

This can happen if disableContentCompression   is set on a pooling manager assigned to your HttpClient  and the target server is trying to use gzip compression

User · Answer

Solution  change the ReuseStrategy to never  Since this problem is very complex and there are so many different factors which can fail I was happy to find this solution in another post  How to solve org apache http NoHttpResponseException  Never reuse connections  configure in org apache http impl client AbstractHttpClient   httpClient setReuseStrategy new NoConnectionReuseStrategy       The same can be configured on a org apache http impl client HttpClientBuilder builder   builder setConnectionReuseStrategy new NoConnectionReuseStrategy

User · Answer

Accepted answer is right but lacks solution  To avoid this error  you can add setHttpRequestRetryHandler  or setRetryHandler for apache components 4 4  for your HTTP client like in this answer

User · Answer

HttpClient 4 4 suffered from a bug in this area relating to validating possibly stale connections before returning to the requestor  It didn t validate whether a connection was stale  and this then results in an immediate NoHttpResponseException   This issue was resolved in HttpClient 4 4 1  See this JIRA and the release notes

User · Answer

Most likely persistent connections that are kept alive by the connection manager become stale  That is  the target server shuts down the connection on its end without HttpClient being able to react to that event  while the connection is being idle  thus rendering the connection half-closed or  stale   Usually this is not a problem  HttpClient employs several techniques to verify connection validity upon its lease from the pool  Even if the stale connection check is disabled and a stale connection is used to transmit a request message the request execution usually fails in the write operation with SocketException and gets automatically retried  However under some circumstances the write operation can terminate without an exception and the subsequent read operation returns -1  end of stream   In this case HttpClient has no other choice but to assume the request succeeded but the server failed to respond most likely due to an unexpected error on the server side   The simplest way to remedy the situation is to evict expired connections and connections that have been idle longer than  say  1 minute from the pool after a period of inactivity  For details please see this section of the HttpClient tutorial

User · Answer

Although accepted answer is right  but IMHO is just a workaround    To be clear  it s a perfectly normal situation that a persistent connection may become stale  But unfortunately it s very bad when the HTTP client library cannot handle it properly   Since this faulty behavior in Apache HttpClient was not fixed for many years  I definitely would prefer to switch to a library that can easily recover from a stale connection problem  e g  OkHttp   Why    OkHttp pools http connections by default  It gracefully recovers from situations when http connection becomes stale and request cannot be retried due to being not idempotent  e g  POST   I cannot say it about Apache HttpClient  mentioned NoHttpResponseException   Supports HTTP 2 0 from early drafts and beta versions    When I switched to OkHttp  my problems with NoHttpResponseException disappeared forever

[java] Apache HttpClient Interim Error: NoHttpResponseException

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