origin servers down

)Disadvantage: local server resources need to be consumed to increase Ajax wait time (negligible)4. Learn from Baidu: as calling any JS file does not involve cross-origin issues, JS scripts can write and call JS files on remote servers to implement the services you need.That is, A. js dynamically calls www.baidu.com/ B .js, where B. js implements the business5. To be studied ...... 1. Use the post subm

= function () { var script = document.createelement (' script '); SCRIPT.SRC = "Http://example.com/callback=test"; Document.appendchild (script);} function Test (res) { console.log (res);} The callback parameter of SRC is used to set the name of the callback function that the backend needs to call, and the data returned by the server is as follows: Test ({ "name": "Xiaoming", "age": + }) This allows the front end to read back-end data across domains. However, JSOPN can onl

1.access-control-allow-origin Specifying formatsThe Origin header field has the following Syntax:origin="Origin:"OWS origin-list-or-NULLOwsorigin-list-or-NULL=%x6e%x75%x6c%x6c/origin-Listorigin-list = Serialized-origin * (SP seria

1. When data is exchanged between the client and the domain controller, each client occupies about 400-K of system resources, that is, about computers in SMT are added to the domain, therefore, when a policy is applied to the client, the system allocates the following resources to the client: 400*400 K or 200 * K, which may be between-M, although the probability of applications to each client at the same time is small, the domain controller should have the function and stability to process data

. There are functions available in CSS3 variants X /Y : translateX() ,,, translateY() scaleX() scaleY() ,, skewX() and skewY() . There is also a matrix function in the three-in-one deformation matrix() , which includes six parameters. CSS3 3D variants include functions such as:,,,, rotateX() rotateY() rotate3d() translateZ() translate3d() , scaleZ() and scale3d() . The CSS3 3D transformation also includes a matrix matrix3d() function, which includes 16 parameters. transform-originprope

Due to browser restrictions, ajax does not allow cross-origin communication. If you try to request data from different domains, a security error occurs. If you can control the remote server where data resides and each request is sent to the same domain, you can avoid these security errors. However, what is the use of Web applications if they only stay on their own servers? If you need to collect data from m

JavaScript code dynamically inserts the script tag, the browser accesses the URL in the src attribute. This will send the information in the query string to the server. In listing 1, username and reservation are passed as name-value pairs. In addition, the query string contains the output format of the request to the server and the name of the callback function (showItinerary ). After the script tag is loaded, the callback function is executed and the information returned from the service is pa

In layman's words, Web server delivery pages allow the browser to browse, whereas the application server provides a method (methods) that the client application can invoke (call). To be exact, you can say that the Web server is dedicated to HTTP requests (request), but the application server is providing (serves) business logic for the application through a number of protocols. 1. The application server processes the business logic, and the Web server is primarily for the customer to access thro

AJAX cross-origin request for JSONP to obtain JSON data, jsonpjson Asynchronous JavaScript and XML (Ajax) is a key technology driving the next generation of Web sites (commonly referred to as Web 2.0 sites. Ajax allows data retrieval in the background without interfering with the display and behavior of Web applications. The XMLHttpRequest function is used to obtain data. It is an API that allows the client JavaScript to connect to a remote server ove

the two pages are the same, you can set the document. domain attribute to regard them as the same source. With the rise of Web2.0 and SNS, Web applications require more and more cross-origin access requests. However, cross-origin requests in scripts are subject to security restrictions, web developers urgently need to provide a safer and more convenient cross-origin