How does ajax set timeout (an action is executed twice)? ajaxaction

How does ajax set timeout (an action is executed twice)? ajaxaction

Today, during the test project, we found that an action was executed twice. This operation took about five minutes to complete. The project environment was apache2 + tomcat6.0.

Several timeout settings have been found during online search:

1. Set the ajax syntax in milliseconds, for example:

$. Ajax ({url: XXX, timeout: 600000, type: 'post', data :{}, error: function () {show_fail_meg ("failed to start the system! ");}});

2. tomcat configuration server. xml in milliseconds

Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" URIEncoding="UTF-8"/>

3. apache configuration file httpd. conf, in seconds

# # Timeout: The number of seconds before receives and sends time out. # Timeout 60

After the modification, it was found that it was still not effective and finally located in the mod_jk module,

Mod_jk, short for JK, is a plug-in module of the Apache server. It provides Apache or IIS server with the ability to process JSP/Servlet.

That is to say, JK settings may overwrite the settings of apache2, tomcat, and ajax.

The configuration file/etc/httpd/conf/workers. properties of JK is as follows:

worker.master.socket_timeout=300

The number is exactly 5 minutes, which is consistent with the exception. Restart After the exception is increased. It is normal!

Ajax times out. The jump function is executed completely.

You sent a request to the background in Ajax and processed it for a long time in the background. ajax is impatient and a timeout prompt is displayed. Can I understand this?

In struts2, jsp pages access action through ajax. How does action return a json data to this jsp page,

Background:

Public class pageAction extends ActionSupport {
Private String username;
Private String password;
Private String cmd;

Public String execute (){
String result = "";
String message = "";
// Create a stream
PrintWriter out = null;
// Create a json object
JSONObject json = new JSONObject ();
Cmd = ServletActionContext. getRequest (). getParameter ("cmd ");
Username = ServletActionContext. getRequest (). getParameter ("username ");
Password = ServletActionContext. getRequest (). getParameter ("password ");
// System. out. println ("username:" + username + ", password:" + password );
If ("admin". equals (username) & "admin". equals (password )){
Json. put ("content", "true ");
} Else {
Json. put ("content", "incorrect account or password! ");
}
Out. write (json. toString ());
Return SUCCESS;
}
}

Front-end:

<Script type = "text/javascript">
Function checkAnswer (){
// Obtain the entered account and password
Var username = document. getElementById ("username"). value;
Var password = document. getElementById ("password"). value;
DataStr = {
Checkname: username,
Checkpass: password
};
JQuery
. Ajax ({
Type: "POST ",
Url: "ajax/checkAnswer. action? Temp = "+ Math. random (),
Data: dataStr,
DataType: "json ",
Success: function (root ){
If (& quo... the remaining full text>