HTTPステータスコード開発

全HTTPステータスコードのクイックリファレンス

⌘K

1xx

Informational

4 個

コード	名前	説明
	Continue	The server has received the request headers and the client should proceed to send the request body.
	Switching Protocols	The requester has asked the server to switch protocols and the server has agreed to do so.
	Processing	The server has received and is processing the request, but no response is available yet.
	Early Hints	Used to return some response headers before the final HTTP message.

2xx

Success

10 個

コード	名前	説明
	OK	The request has succeeded. The meaning of success depends on the HTTP method.
	Created	The request has been fulfilled and a new resource has been created.
	Accepted	The request has been accepted for processing, but processing has not been completed.
	Non-Authoritative Information	The server successfully processed the request but is returning information from another source.
	No Content	The server successfully processed the request and is not returning any content.
	Reset Content	The server successfully processed the request and asks the requester to reset its document view.
	Partial Content	The server is delivering only part of the resource due to a range header sent by the client.
	Multi-Status	The response body contains multiple separate response codes for batch operations.
	Already Reported	The members of a DAV binding have already been enumerated in a preceding part of the response.
	IM Used	The server has fulfilled a request and the response is the result of instance manipulations on the current instance.

3xx

Redirection

7 個

コード	名前	説明
	Multiple Choices	Indicates multiple options for the resource from which the client may choose.
	Moved Permanently	This and all future requests should be directed to the given URI.
	Found	The resource is temporarily located at a different URI.
	See Other	The response to the request can be found under another URI using the GET method.
	Not Modified	The resource has not been modified since the version specified by the request headers.
	Temporary Redirect	The request should be repeated at another URI, but future requests should still use the original URI.
	Permanent Redirect	The request and all future requests should be repeated using another URI, preserving the HTTP method.

4xx

Client Error

40 個

コード	名前	説明
	Bad Request	The server cannot process the request due to a client error, such as malformed syntax.
	Unauthorized	Authentication is required and has failed or has not been provided.
	Payment Required	Reserved for future use, originally intended for digital payment systems.
	Forbidden	The server understood the request but refuses to authorize it.
	Not Found	The requested resource could not be found but may be available in the future.
	Method Not Allowed	The request method is not supported for the requested resource.
	Not Acceptable	The server cannot produce a response matching the acceptable values in the request headers.
	Proxy Authentication Required	The client must first authenticate itself with the proxy.
	Request Timeout	The server timed out waiting for the request.
	Conflict	The request could not be processed because of a conflict with the current state of the resource.
	Gone	The resource requested was previously in use but is no longer available and will not be available again.
	Length Required	The server refuses to accept the request without a defined Content-Length header.
	Precondition Failed	The server does not meet one of the preconditions specified in the request headers.
	Content Too Large	The request body is larger than the server is willing or able to process.
	URI Too Long	The URI provided was too long for the server to process.
	Unsupported Media Type	The request entity has a media type which the server or resource does not support.
	Range Not Satisfiable	The client has asked for a portion of the file, but the server cannot supply that portion.
	Expectation Failed	The server cannot meet the requirements of the Expect request-header field.
	I'm a Teapot	Defined in RFC 2324 as an April Fools' joke; a teapot refuses to brew coffee.
	Enhance Your Calm	Twitter/XRate limiting response. Non-standard; superseded by 429 Too Many Requests.
	Misdirected Request	The request was directed at a server that is not able to produce a response.
	Unprocessable Content	The request was well-formed but could not be followed due to semantic errors.
	Locked	The resource that is being accessed is locked.
	Failed Dependency	The request failed because it depended on another request that failed.
	Too Early	The server is unwilling to risk processing a request that might be replayed.
	Upgrade Required	The client should switch to a different protocol, such as TLS/1.3.
	Precondition Required	The origin server requires the request to be conditional to prevent conflicts.
	Too Many Requests	The user has sent too many requests in a given amount of time (rate limiting).
	Request Header Fields Too Large	The server is unwilling to process the request because the header fields are too large.
	Login Timeout	IISThe client's session has expired and must log in again.
	No Response	nginxCloses the connection without sending any response, typically used to deny malicious requests.
	Retry With	IISThe server requires the client to resend the request with more information.
	Unavailable For Legal Reasons	The server is denying access to the resource as a consequence of a legal demand.
	Client Closed Connection	AWSThe client closed the connection before the load balancer could send the request to the target.
	Too Many IP Addresses	AWSThe X-Forwarded-For header contains more than 30 IP addresses.
	Request Header Too Large	nginxThe request headers exceed the server's configured limit.
	SSL Certificate Error	nginxAn error occurred while verifying the client SSL certificate.
	SSL Certificate Required	nginxThe client did not provide a required SSL certificate.
	HTTP Request Sent to HTTPS Port	nginxA plain HTTP request was sent to an HTTPS port.
	Client Closed Request	nginxThe client closed the connection before the server could send a response.

5xx

Server Error

21 個

コード	名前	説明
	Internal Server Error	A generic error message when the server encounters an unexpected condition.
	Not Implemented	The server does not recognize the request method or lacks the ability to fulfill it.
	Bad Gateway	The server, acting as a gateway or proxy, received an invalid response from the upstream server.
	Service Unavailable	The server is temporarily unable to handle the request, due to overload or scheduled maintenance.
	Gateway Timeout	The server, acting as a gateway or proxy, did not receive a timely response from the upstream server.
	HTTP Version Not Supported	The server does not support the HTTP version used in the request.
	Variant Also Negotiates	Transparent content negotiation for the request results in a circular reference.
	Insufficient Storage	The server is unable to store the representation needed to complete the request.
	Loop Detected	The server detected an infinite loop while processing the request.
	Not Extended	Further extensions to the request are required for the server to fulfill it.
	Network Authentication Required	The client needs to authenticate to gain network access (e.g., captive portal).
	Web Server Returns an Unknown Error	CloudflareThe origin server returned an empty, unknown, or unexpected response.
	Web Server Is Down	CloudflareThe origin server refused the connection.
	Connection Timed Out	CloudflareThe TCP handshake with the origin server timed out.
	Origin Is Unreachable	CloudflareCannot reach the origin server, possibly due to DNS resolution failure.
	A Timeout Occurred	CloudflareA TCP connection was established but the origin server did not reply in time.
	SSL Handshake Failed	CloudflareThe SSL handshake with the origin server failed.
	Invalid SSL Certificate	CloudflareCould not validate the SSL certificate on the origin server.
	Railgun Error	CloudflareThe Railgun connection to the origin server was interrupted (deprecated feature).
	Origin DNS Error	CloudflareCannot resolve the origin server's DNS, usually accompanied by a 1xxx error.
	Unauthorized	AWSThe identity provider returned an error code during authentication.