What causes HttpHostConnectException

Question

I have a  Auto Complete type ahead feature on Search for my website  I see that some time  their is an exception associated with it  We are using a proxy server   org apache http conn HttpHostConnectException  Connection to http   proxy xyz com 60 refused      at org apache http impl conn DefaultClientConnectionOperator openConnection DefaultClientConnectionOperator java 159  at org apache http impl conn AbstractPoolEntry open AbstractPoolEntry java 149  at org apache http impl conn AbstractPooledConnAdapter open AbstractPooledConnAdapter java 108  at org apache http impl client DefaultRequestDirector execute DefaultRequestDirector java 415  at org apache http impl client AbstractHttpClient execute AbstractHttpClient java 641  at org apache http impl client AbstractHttpClient execute AbstractHttpClient java 576  at org apache http impl client AbstractHttpClient execute AbstractHttpClient java 554  at com xxx dd sone integration SearchDAO getJSONData SearchDAO java 60  at com xxx dd sone integration SearchDAO searchAutoCompleteResults SearchDAO java 560  at com xxx dd sone presentation util SearchAutoCompleteUtil doGet SearchAutoCompleteUtil java 26  at javax servlet http HttpServlet service HttpServlet java 731  at javax servlet http HttpServlet service HttpServlet java 845  at weblogic servlet internal StubSecurityHelper ServletServiceAction run StubSecurityHelper java 242  at weblogic servlet internal ServletStubImpl execute ServletStubImpl java 352  at weblogic servlet internal ServletStubImpl execute ServletStubImpl java 236  at weblogic servlet internal WebAppServletContext ServletInvocationAction run WebAppServletContext java 3254  at weblogic servlet provider WlsSubjectHandle run WlsSubjectHandle java 57  at weblogic servlet internal WebAppServletContext doSecuredExecute WebAppServletContext java 2163  at weblogic servlet internal WebAppServletContext execute WebAppServletContext java 2074  at weblogic servlet internal ServletRequestImpl run ServletRequestImpl java 1512  at weblogic servlet provider ContainerSupportProviderImpl WlsRequestExecutor run ContainerSupportProviderImpl java 255  at weblogic work ExecuteRequestAdapter execute ExecuteRequestAdapter java 22  at weblogic kernel ExecuteThread execute ExecuteThread java 147  at weblogic kernel ExecuteThread run ExecuteThread java 119    Caused by  java net ConnectException  Connection refused  Here is the how i have coded  public HashMap lt String  Object gt  getJSONData String url throws Exception       DefaultHttpClient httpClient   new DefaultHttpClient        HttpParams params   httpClient getParams        try           HttpConnectionParams setConnectionTimeout params  10000           HttpConnectionParams setSoTimeout params  10000         catch  Exception e            e printStackTrace            throw e            HttpHost proxy   new HttpHost proxy xyz com  60       ConnRouteParams setDefaultProxy params  proxy       URI uri      InputStream data   null          uri   new URI url           HttpGet method   new HttpGet uri           HttpResponse response null          try           response   httpClient execute method            catch Exception e                e printStackTrace                throw e                    data   response getEntity   getContent        Reader r   new InputStreamReader data       HashMap lt String  Object gt  jsonObj    HashMap lt String  Object gt   GenericJSONUtil fromJson r       return jsonObj      Can any one tell me why i am getting this exception some time only  is this possible that this exception is caused when a search request is made from Android applications as our website don t support a request is being made from android applications

User · Answer

In my case the issue was a missing  s  in the HTTP URL   Error was   HttpHostConnectException  Connect to someendpoint com 80  someendpoint com 127 0 0 1  failed  Connection refused   End point and IP obviously changed to protect the network

User · Answer

You must set proxy server for gradle at some time  you can try to change the proxy server ip address in gradle properties which is under  gradle document

User · Answer

A  connection refused  error happens when you attempt to open a TCP connection to an IP address   port where there is nothing currently listening for connections   If nothing is listening  the OS on the server side  refuses  the connection   If this is happening intermittently  then the most likely explanations are  IMO     the server you are talking   proxy xyz com    port 60  to is going up and down  OR there is something1 between your client and the proxy that is intermittently sending requests to a non-functioning host  or something       Is this possible that this exception is caused when a search request is made from Android applications as our website don t support a request is being made from android applications    It seems unlikely   You said that the  connection refused  exception message says that it is the proxy that is refusing the connection  not your server   Besides if a server was going to not handle certain kinds of request  it still has to accept the TCP connection to find out what the request is     before it can reject it     1 - For example  it could be a DNS that round-robin resolves the DNS name to different IP addresses   Or it could be an IP-based load balancer

[java] What causes HttpHostConnectException?

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