A closer look at HTTP status code 100: What does it mean?

Learn more about HTTP status code 100: What does it mean?

The HTTP protocol is one of the most commonly used protocols in modern Internet applications. It defines the standard specifications required for communication between browsers and web servers. During the process of HTTP request and response, the server will return various types of status codes to the browser to reflect the processing of the request. Among them, HTTP status code 100 is a special status code used to indicate "continue".

HTTP status code consists of three digits, and each status code has a specific meaning. 200 means the request was successful, 404 means the resource was not found, 500 means an internal server error, etc. The HTTP status code 100 is an intermediate status code. It does not directly indicate whether the request is successful or failed, but is used to prompt the browser that the client request was received by the server and is waiting for further instructions.

When the browser sends a request to the server, if the server thinks it still needs some additional information to continue processing the request, it will return an HTTP status code 100. This usually happens when the client sends a large POST request to the server, and the server takes time to process the request and requires the client to continue sending the remaining request data.

In fact, HTTP status code 100 is an enhanced feature in the HTTP/1.1 protocol. It is designed as an interactive response code that allows for more interaction between the client and server before sending the HTTP request. After receiving status code 100, the client can continue to send request data according to the instructions of the server, or cancel the request.

It should be noted that HTTP status code 100 will only be returned when the client sends the Expect request header. The Expect request header can be used to inform the server that the client expects the server to return a status code and response body. If the server does not support the Expect request header, it may ignore the request header and return a normal response.

For most users, HTTP status code 100 is not a common status code because most HTTP requests are completed instantaneously. However, in some specific scenarios, this status code may play an important role, especially in requests that require long or complex processing.

In summary, HTTP status code 100 represents a special interactive state, which prompts the browser to continue sending request data or cancel the request. It's uncommon for most users, but it can provide a more flexible way to interact with certain requests that require long or complex processing. Understanding the meaning of HTTP status code 100 will help us better understand and debug the process of network requests.

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