PREVIEW.md

HTTP Status Extra Preview

1xx Information

1xx codes are often interim responses for sharing connection status information. Not intended for final request or response action.

Standard 1xx Information

Emoji	Code	Message	Description
🏁	100	Continue	The server has received the request headers, and the client should proceed to send the request body.
🔌	101	Switching Protocols	The requester has asked the server to switch protocols.
🖥	102	Processing	This code indicates that the server has received and is processing the request, but no response is available yet. This prevents the client from timing out and assuming the request was lost.
🗣	103	Early Hints	Used to return some response headers before final HTTP message.

2xx Successful

2xx codes indicate successful responses usually this means the action requested by the client was received, understood and accepted successfully.

Standard 2xx Successful

Emoji	Code	Message	Description
✅	200	OK	The request is OK (this is the standard response for successful HTTP requests).
📝	201	Created	The request has been fulfilled, and a new resource is created.
🔄	202	Accepted	The request has been accepted for processing, but the processing has not been completed.
💫	203	Non-Authoritative Information	The request has been successfully processed, but is returning information that may be from another source.
💭	204	No Content	The request has been successfully processed, but is not returning any content.
🎉	205	Reset Content	The request has been successfully processed, but is not returning any content, and requires that the requester reset the document view.
🎊	206	Partial Content	The server is delivering only part of the resource due to a range header sent by the client.
🎏	207	Multi-Status	The message body that follows is by default an XML message and can contain a number of separate response codes, depending on how many sub-requests were made.
📢	208	Already Reported	The members of a DAV binding have already been enumerated in a preceding part of the (multistatus) response, and are not being included again.
📣	226	IM Used	The server has fulfilled a request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance.

Non-Standard 2xx Successful

Emoji	Code	Message	Standard	Description
🆗	218	This is fine	unofficial	Used as a catch-all error condition for allowing response bodies to flow through Apache when ProxyErrorOverride is enabled.

3xx Redirection

3xx codes are a class of responses that suggest the User-Agent must follow another course of action to obtain the complete requested resource.

Standard 3xx Redirection

Emoji	Code	Message	Description
🔀	300	Multiple Choices	A link list. The user can select a link and go to that location. Maximum five addresses.
🚚	301	Moved Permanently	The requested page has moved to a new URL.
🔎	302	Found	The requested page has moved temporarily to a new URL.
📨	303	See Other	The requested page can be found under a different URL.
💠	304	Not Modified	Indicates the requested page has not been modified since last requested.
ℹ️	307	Temporary Redirect	The requested page has moved temporarily to a new URL.
🆕	308	Permanent Redirect	Used in the resumable requests proposal to resume aborted PUT or POST requests.

Non-Standard 3xx Redirection

Emoji	Code	Message	Standard	Description
🔃	306	Switch Proxy	unofficial	No longer used. Originally meant "Subsequent requests should use the specified proxy."

4xx Client Error

4xx codes generally are error responses specifying an issue at the client’s end. Potentially a network issue.

Standard 4xx Client Error

Emoji	Code	Message	Description
🚫	400	Bad Request	The request cannot be fulfilled due to bad syntax.
🔐	401	Unauthorized	The request was a legal request, but the server is refusing to respond to it. For use when authentication is possible but has failed or not yet been provided.
💰	402	Payment Required	Not yet implemented by RFC standards, but reserved for future use.
⛔	403	Forbidden	The request was a legal request, but the server is refusing to respond to it.
❓	404	Not Found	The requested page could not be found but may be available again in the future.
❗	405	Method Not Allowed	A request was made of a page using a request method not supported by that page.
🛡	406	Not Acceptable	The server can only generate a response that is not accepted by the client.
🔩	407	Proxy Authentication Required	The client must first authenticate itself with the proxy.
⌛️	408	Request Timeout	The server timed out waiting for the request.
💥	409	Conflict	The request could not be completed because of a conflict in the request.
💨	410	Gone	The requested page is no longer available.
📏	411	Length Required	The "Content-Length" is not defined. The server will not accept the request without it.
🛑	412	Precondition Failed	The precondition given in the request evaluated to false by the server.
🗃	413	Payload Too Large	The server will not accept the request, because the request entity is too large.
🆖	414	URI Too Long	The server will not accept the request, because the URL is too long. Occurs when you convert a POST request to a GET request with a long query information.
📼	415	Unsupported Media Type	The server will not accept the request, because the media type is not supported.
📐	416	Range Not Satisfiable	The client has asked for a portion of the file, but the server cannot supply that portion.
🤔	417	Expectation Failed	The server cannot meet the requirements of the Expect request-header field.
🍵	418	I'm a Teapot	Any attempt to brew coffee with a teapot should result in the error code "418 I'm a teapot". The resulting entity body MAY be short and stout.
🔂	421	Misdirected Request	The request was directed at a server that is not able to produce a response (for example because a connection reuse).
💩	422	Unprocessable Entity	The request was well-formed but was unable to be followed due to semantic errors.
🔒	423	Locked	The resource that is being accessed is locked.
😒	424	Failed Dependency	The request failed due to failure of a previous request.
📤	426	Upgrade Required	The client should switch to a different protocol such as TLS/1.0, given in the Upgrade header field.
⛓	428	Precondition Required	The origin server requires the request to be conditional.
🌋	429	Too Many Requests	The user has sent too many requests in a given amount of time. Intended for use with rate limiting schemes.
🤮	431	Request Header Fields Too Large	The server is unwilling to process the request because either an individual header field, or all the header fields collectively, are too large.
🔏️	451	Unavailable For Legal Reasons	A server operator has received a legal demand to deny access to a resource or to a set of resources that includes the requested resource.

Non-Standard 4xx Client Error

Emoji	Code	Message	Standard	Description
🕰	419	Page Expired	unofficial	Used by the Laravel Framework when a CSRF Token is missing or expired.
🤖	420	Method Failure	unofficial	A deprecated response used by the Spring Framework when a method has failed.
🚪	436	Host Not Matched	aasaam	Host header not found or not match matched, check your url and use valid host name(instead of IP address) or ask administrators for help
🚮	437	Legacy browser	aasaam	Your request was blocked because you are using outdated browser. Try to download new version of most secure and standard browser.
📛	438	Intrusion Detected	aasaam	Your request was blocked by Web Application Firewall (WAF).
🚷	439	Access denied	aasaam	Your request was blocked by access rules.
🛂	440	Login Time	iis	The client's session has expired and must log in again. (IIS)
🗑	444	No Response	nginx	A non-standard status code used to instruct nginx to close the connection without sending a response to the client, most commonly used to deny malicious or malformed requests.
🛃	449	Retry With	iis	The server cannot honour the request because the user has not provided the required information. (IIS)
🔞	450	Blocked by Windows Parental Controls	unofficial	The Microsoft extension code indicated when Windows Parental Controls are turned on and are blocking access to the requested webpage.
⏱	460	Client closed the connection	elasticloadbalancing	Client closed the connection with the load balancer before the idle timeout period elapsed. Typically when client timeout is sooner than the Elastic Load Balancer's timeout.
🌡	463	X-Forwarded-For is to long	elasticloadbalancing	The load balancer received an X-Forwarded-For request header with more than 30 IP addresses.
🐳	494	Request header too large	nginx	Used by nginx to indicate the client sent too large of a request or header line that is too long.
🏅	495	SSL Certificate Error	nginx	An expansion of the 400 Bad Request response code, used when the client has provided an invalid client certificate.
🏷	496	SSL Certificate Required	nginx	An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided.
❎	497	HTTP Request Sent to HTTPS Port	nginx	An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests.
🆔	498	Invalid Token	unofficial	Returned by ArcGIS for Server. Code 498 indicates an expired or otherwise invalid token.
🚶🏽	499	Client Closed Request	nginx	A non-standard status code introduced by nginx for the case when a client closes the connection while nginx is processing the request.

5xx Server Error

5xx error codes indicate that an error or unresolvable request occurred on the server side, whether that is a proxy or the origin host.

Standard 5xx Server Error

Emoji	Code	Message	Description
💣	500	Internal Server Error	An error has occurred in a server side script, a no more specific message is suitable.
📭	501	Not Implemented	The server either does not recognize the request method, or it lacks the ability to fulfill the request.
🚧	502	Bad Gateway	The server was acting as a gateway or proxy and received an invalid response from the upstream server.
🚨	503	Service Unavailable	The server is currently unavailable (overloaded or down).
⏲	504	Gateway Timeout	The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.
🕯	505	HTTP Version Not Supported	The server does not support the HTTP protocol version used in the request.
💔	506	Variant Also Negotiates	Transparent content negotiation for the request results in a circular reference.
💯	507	Insufficient Storage	The server is unable to store the representation needed to complete the request.
➰	508	Loop Detected	The server detected an infinite loop while processing the request (sent instead of 208 Already Reported).
📈	509	Bandwidth Limit Exceeded	The server has exceeded the bandwidth specified by the server administrator; this is often used by shared hosting providers to limit the bandwidth of customers.
🏗	510	Not Extended	Further extensions to the request are required for the server to fulfil it.
🔑	511	Network Authentication Required	The client needs to authenticate to gain network access.

Non-Standard 5xx Server Error

Emoji	Code	Message	Standard	Description
🔴	520	Unknown Error	cloudflare	The 520 error is used as a "catch-all response for when the origin server returns something unexpected", listing connection resets, large headers, and empty or invalid responses as common triggers.
💤	521	Web Server Is Down	cloudflare	The origin server has refused the connection from Cloudflare.
⌚️	522	Connection Timed Out	cloudflare	Cloudflare could not negotiate a TCP handshake with the origin server.
🏚	523	Origin Is Unreachable	cloudflare	Cloudflare could not reach the origin server; for example, if the DNS records for the origin server are incorrect.
⏰	524	A Timeout Occurred	cloudflare	Cloudflare was able to complete a TCP connection to the origin server, but did not receive a timely HTTP response.
🤝	525	SSL Handshake Failed	cloudflare	Cloudflare could not negotiate a SSL/TLS handshake with the origin server.
🚑	526	Invalid SSL Certificate	cloudflare	Used by Cloudflare and Cloud Foundry's gorouter to indicate failure to validate the SSL/TLS certificate that the origin server presented.
🔘	527	Railgun Error	cloudflare	Error 527 indicates that the request timed out or failed after the WAN connection had been established.
🌨	530	Site is frozen	cloudflare	Error 530 indicates that the requested host name could not be resolved on the Cloudflare network to an origin server.
📜	538	Temporary down	aasaam	According to contract, service not available. Call the support for more information.
🥀	598	Network read timeout error	unofficial	Used by some HTTP proxies to signal a network read timeout behind the proxy to a client in front of the proxy.