In-depth explanation of HTTP response status code cheat sheet_PHP tutorial

HTTP header information check URL HTTP Server Response Code Checker

Common response status codes

1**: The request is received, continue processing
2**: The operation is successfully received, analyzed and accepted
3**: This request must be processed further
4**: The request contains An incorrect syntax or failure to complete
5**: The server failed to perform a fully valid request

100 - The client must continue to make requests
101 - The client requires the server to convert the HTTP protocol version according to the request

200——Transaction successful
201——Prompt to know the URL of the new file
202——Accepted and processed, but the processing is not completed
203——Return information is uncertain or incomplete
204——Request received, but the return information is empty
205——The server has completed the request, the user agent must reset the currently browsed files
206——The server has completed some users’ GET requests

300 - The requested resource is available in multiple places
301 - Delete the request data
302 - The request data was found at another address
303 - Recommend the customer to visit other URLs or access methods
304 - The client has performed GET, but the file has not changed
305 - The requested resource must be obtained from the address specified by the server
306 - Code used in the previous version of HTTP, current version No longer used in
307 - Declaring that the requested resource is temporarily deleted

400 - Bad request, such as syntax error
401 - Request authorization failed
402 - Retain valid ChargeTo header response
403 - Request not allowed
404 - No file found , query or URl
405 - The method defined by the user in the Request-Line field is not allowed
406 - According to the Accept drag sent by the user, the requested resource is not accessible
407 - Similar to 401, the user must first Authorized on the proxy server
408 - The client did not complete the request within the user-specified time
409 - The request cannot be completed for the current resource status
410 - This is no longer available on the server Resource with no further reference
411 - The server rejected the user-defined Content-Length attribute request
412 - One or more request header fields are incorrect in the current request
413 - The requested resource Larger than the size allowed by the server
414 - The requested resource URL is longer than the length allowed by the server
415 - The requested resource does not support the requested item format
416 - The request contains the Range request header field, which is in the current request There is no range indication value in the resource range, and the request
does not contain the If-Range request header field
417 - the server does not meet the expectations specified by the request Expect header field. If it is a proxy server, it may be the next
one The level server cannot fulfill the request

500 - The server generated an internal error
501 - The server does not support the requested function
502 - The server is temporarily unavailable, sometimes to prevent system overload from occurring
503 - The server is overloaded or suspended Maintenance
504 - The gateway is overloaded, the server uses another gateway or service to respond to the user, and the waiting time is set to a long value
505 - The server does not support or refuses to support the HTTP version specified in the request header

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