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In web programming, we often encounter cross-domain issues. By default, browsers do not allow cross-domain access. Therefore, there is a concept here: CORS (Cross-Origin Resource Sharing). Before the HTML5 standard came out, CORS was not al...

We have previously introduced the principle of cross-domain single sign-on in "Detailed explanation of the implementation methods of three situations of SSO single sign-on" . Here we will introduce how to implement single sign-on using PHP...

To become a developer of WeChat official account, you must first have a server that can be accessed externally. The development of WeChat official account does not limit the use of any language. Here we use PHP as the development language....

During the development of WeChat official accounts, if we want to actively push messages to the WeChat server, we must have access_token. Access_token is the only ticket for the official account. When we develop and call various WeChat inte...

There are two situations when WeChat users interact with public accounts: one is when WeChat users send ordinary messages to public accounts; the other is when some operations of WeChat users cause the WeChat server to notify the URL filled...

As we know, there are two types of messages generated by the interaction between WeChat users and public accounts: one is ordinary messages, which are introduced in detail in the article "Ordinary message processing for WeChat public accoun...

Ajax is widely used in web systems, but cross-domain issues are often encountered in web systems. By default, browsers prohibit Ajax cross-domain access. The IE browser has particularly strict restrictions. For browsers such as Firefox, Goo...

HTTPS is a protocol for secure communication over computer networks and is widely used on the Internet. More and more website owners are migrating from HTTP to HTTPS, mainly due to the following 5 reasons: Google announced that websites usi...

Installing a Secure Sockets Layer (SSL) certificate on your WordPress site enables it to use HTTPS for a secure connection. Unfortunately, there are a lot of things that can go wrong in the process of verifying a valid SSL certificate and e...

Having an SSL certificate gives people more peace of mind when using your website. When the NET::ERR_CERT_DATE_INVALID error indicates a problem with the certificate, it blocks visitors from accessing your website until the problem is fixed...

Does anyone keep telling you to “clear your browser cache”? This is important diagnostic information when you’re having problems with a website, such as a 304 error. But what does clearing your browser cache actually mean, and how do...

Let's Encrypt is a free, automated, and open certificate authority that officially launched in April 2016. It was originally founded in 2012 by two Mozilla employees. Their goal for founding Let's Encrypt was really simple; to encrypt the e...

HTTP was originally proposed by Timberners-Lee, a pioneer of the World Wide Web, who designed the application protocol with simplicity in mind to perform advanced data communication functions between web servers and clients. The first docum...

HTTP 1.1 is limited to handling only one outstanding request per TCP connection, forcing browsers to use multiple TCP connections to handle multiple requests simultaneously. However, using too many TCP connections in parallel can cause TCP...

Before we officially introduce the functions of HTTP/2, let's take a detour to understand the past and present of HTTP/2 . Multiplexing Streams The bidirectional sequence of text-formatted frames sent via the HTTP/2 protocol exchanged betwe...