HTTP Timeout settings

The timeout can be set in the HTTP protocol (connection timeout, response timeout), as follows:

1, the Java API way:

Previous versions of JDK 1.5, you can only control network timeouts by setting two system properties:

String szurl = "http://www.ee2ee.com/"; URL url = new URL (szurl); HttpURLConnection Urlcon = (httpurlconnection) url.openconnection ();//httpurlconnection is based on the HTTP protocol, and its underlying is implemented via socket communication. If you do not set a time-out (timeout), in the case of a network exception, it may cause the program to zombie without continuing to execute. The corresponding timeout can be set by the following two statements: System.setproperty ("Sun.net.client.defaultConnectTimeout", string of timeout milliseconds); System.setproperty ("Sun.net.client.defaultReadTimeout", time-out number of milliseconds string);// Sun.net.client.defaultConnectTimeout: Timeout in milliseconds for connecting the host//sun.net.client.defaultreadtimeout: Time-out (in milliseconds) to read data from the host

In 1.5, you can also use the following two methods of HttpURLConnection's parent class URLConnection:
Setconnecttimeout: Setting the connection host timeout (in milliseconds)
Setreadtimeout: Setting read data timeout from host (in milliseconds)

HttpURLConnection Urlcon = (httpurlconnection) url.openconnection (); Urlcon.setconnecttimeout (30000); Urlcon.setreadtimeout (30000);

Note that, in the JDK1.4.2 environment, I found that in the case of setting up Defaultreadtimeout, if a network timeout occurs, HttpURLConnection will automatically resubmit the request, a request call, Request Server two times problem (trouble). I think this is a bug in JDK1.4.2. In JDK1.5.0, this issue has been resolved and there is no automatic re-occurrence. Out "," 30000″);

2, HttpClient:

HttpClient Tool class, each version of the different:
3.X is like this.
HttpClient httpclient=new defaulthttpclient ();
4.3 that's it.
Closeablehttpclient httpClient = Httpclients.createdefault ();

httpclient has three timeout settings:
1) 3. The timeout method for x is
HttpClient client = new HttpClient ();
Client.setconnectiontimeout (30000);  
Client.settimeout (30000);

HttpClient httpclient= New HttpClient ();  
Httpclient.gethttpconnectionmanager (). Getparams (). Setconnectiontimeout (5000);
2) 4. The x version of the timeout setting (4.3 is obsolete)
HttpClient httpclient=new defaulthttpclient ();
Httpclient.getparams (). Setparameter (coreconnectionpnames.connection_timeout,2000);//Connection Time
Httpclient.getparams (). Setparameter (coreconnectionpnames.so_timeout,2000);//Data transfer time
3) 4.3 version timeout setting
Closeablehttpclient httpClient = Httpclients.createdefault ();
HttpGet httpget=new httpget ("http://www.baidu.com");//http Get request (post identical)
Requestconfig requestconfig = Requestconfig.custom (). SetSocketTimeout (. setconnecttimeout). Build ();//Set request and transmit timeout time
Httpget.setconfig (Requestconfig);
Httpclient.execute (HttpGet);//Execute request

3. When using curl, there are two timeouts: one is the connection timeout time and the other is the maximum allowable time for data transfer.
The connection time-out is specified with the--connect-timeout parameter, and the maximum allowable time for data transfer is specified with the-m parameter.
For example:
Curl--connect-timeout 10-m "Http://XXXXXXX"
If the connection times out, the error message is as follows:
Curl: (+) Connect () timed out!
When the maximum allowable time for data transfer expires, the error message is as follows:
Curl: (operation) timed out after 0 bytes received milliseconds

4. Ajax:

1) in older versions of XMLHttpRequest, there is no timeout attribute, so if you use JavaScript native old Ajax requests, you can only do this by manually setting up settimeout and Cleartimeout ( These two methods are methods of the Window object)

function Createxmlhttprequest () {var request = false; if (window.          XMLHttpRequest) {request = new XMLHttpRequest ();          if (request.overridemimetype) {request.overridemimetype (' text/xml '); }} else if (window. ActiveXObject) {var versions = [' Microsoft.XMLHTTP ', ' MSXML. XMLHTTP ', ' microsoft.xmlhttp ', ' msxml2.xmlhttp.7.0 ', ' msxml2.xmlhttp.6.0 ', ' MSXML2.XMLHT tp.5.0 ', ' msxml2.xmlhttp.4.0 ', ' MSXML2. xmlhttp.3.0 ', ' MSXML2.          XMLHTTP ']; for (var i = 0; i < versions.length; i++) {try {request = new ActiveXObject (versions[i                  ]);                  if (request) {return request;  }} catch (e) {}}} return request;      } function Ajax (XMLHTTP, _method, _url, _param, _callback) {if (typeof xmlhttp = = ' undefined ') return; Xmlhttp.onreadystatechange= function () {if (xmlhttp.readystate = = 4 && Xmlhttp.status = =) {_callback (XMLHTTP);      }      };      Xmlhttp.open (_method, _url, true); if (_method = = "POST") {Xmlhttp.setrequestheader ("Content-type", "Application/x-www-form-urlenc          Oded ");          Xmlhttp.setrequestheader ("Content-length", _param.length);      Xmlhttp.send (_param);      } else {xmlhttp.send (null);  }}//use example var xmlhttp = Createxmlhttprequest (); var T1;      Used for timeout processing function Adduserok (request) {//alert (Request.responsetext);  if (T1) cleartimeout (t1);      } function Connecttofail () {if (XMLHTTP) xmlhttp.abort ();  Alert (' Time Out '); } if (XMLHTTP) {Ajax (XMLHTTP, "POST", "http://10.1.2.187/adduser.cgi", "Act=do&user=abc", Addusero      k);  T1 = SetTimeout (Connecttofail, 30000);  } else {alert ("Init XMLHttpRequest fail");   }

2) The above-mentioned manual processing of Ajax for the initial stage, if using the jquery framework, you can set the Timeout timeout property in jquery:

$.ajax ({url: ',///  request URL timeout:1000,//time-out setting, unit millisecond type: ' Get ',  //Request method, get or Post data: {},  //request parameter, J　　Son format dataType: ' JSON ',//returns the data format success:function (data) {//Request successful callback function alert ("Success"); 　　　　　 }, Complete:function (xmlhttprequest,status) {//The final execution of the parameter if (status== ' timeout ') {//timeout, status and Success,error equivalent when the request is completed　　　　　Ajaxtimeouttest.abort ();　　　　  alert ("timeout"); }　　}});

3) XMLHttpRequest Level2 new version, the timeout attribute is added, and there is a timeout event:

Xhr.timeout = 3000;xhr.ontimeout = function (event) {alert (' Request timed out! ');}

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

HTTP Timeout settings