In-depth understanding of HTTP status code: API debugging and network miscalculation compass
In an Internet communication protocol, HTTP status code (HTTP Status Code) is the server moving to the client (e.g. browser or moving) App) Standard ways to provide feedback on the results of requests. Each of the three numbers contains a specific semantic code, indicating whether the request was successful, reoriented or whether an error was encountered. For developers, mastery of state code is efficient. The basis for the development of API, the back-end debugging and the web site.
Five major categories for HTTP status code
The HTTP protocol divides the status code into five broad categories, each of which represents a different nature of response:
- 1xx (information response): The request has been received and is being processed. Such status codes are less directly exposed to day-to-day developments.
- 2xx (successful response): The most reassuring code is that the server has successfully received, understood and accepted the request.
- 3xx (redirection): This means that in order to complete the request, the client needs to perform further operations, usually jump to another URL.
- 4xx (customer error): It was noted that the request contained a grammatical error or could not be completed. This is the wrong focus that front-end developers need most of their attention.
- 5xx (server error): Shows that the server made an internal error while trying to process the request. Such problems usually require the involvement of back-end engineers.
Core state code resolution most commonly encountered by developers
200 OK & 201 Created
200 is the most common sign of success. and when in the RESTful API design, through POST It is more normative to request the return of 201 Created when a new resource (e.g. registered user) is successfully created.
301 Moved Permanently vs 302 Found
This is the key to sEO optimization. 301 represents a permanent reorientation whereby the search engine shifts the weight of the old URL to the new URL; And 302 It's a temporary reorientation, and it doesn't transfer weights. For re-version of the website, use 301.
401 Unauthorized vs 403 Forbidden
401 indicates that “I do not know who you are, please provide a certificate”; 403 “I know who you are, but you have no access to this resource”. The distinction between the two would help to construct a more precise logic of control of authority.
404 Not Found
This is probably the most famous status code in the world. It indicates that the requested resources could not be found on the server. Too much for SEO 404 The page will damage the credibility of the site.
500 Internal Server Error & 503 Service Unavailable
500 is a general error at the back end, which usually means that the program has dropped uncaptured anomalies. 503 It usually appears when the server is maintained or overloaded.
Retry-After
Head use can inform the client when to retry.
How can we use the KiloCell of-gauge checklists to improve efficiency?
Our interactive checklists not only provide translations of standard definitions, but also support Real-time Fuzzy Search 。 You can enter a status code number or a Chinese keyword (e.g. " Permissions " , " Redirect " ). In addition, each state code is a visual color code (Color-coded), which allows you to recognize the magnitude of the error. Keep this page open while performing interfaces, saves you a lot of viewing Time for MDN or RFC documents.
Summary
HTTP status code is Web The “common language” among developers. A well-designed system should be able to return accurate and semantic state codes, which not only help the front-end rapid feedback users but also provide high-quality data sources for system monitoring and log analysis. Thousands You can also use the best and most convenient tools for your development.