HTTP Status Code 400 - Bad Request

This response means that server could not understand the request due to invalid syntax.

The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).

The request could not be understood by the server due to malformed syntax. The client SHOULD NOT repeat the request without modifications.

Wikipedia

The request cannot be fulfilled due to bad syntax.

General error when fulfilling the request would cause an invalid state. Domain validation errors, missing data, etc. are some examples.

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HTTP Status Code 402 - Payment Required

This response code is reserved for future use. Initial aim for creating this code was using it for digital payment systems however this is not used currently. Wikipedia Reserved for future use. The original intention was that this code might be used as part of some form of digital cash or micropayment scheme, but that has not happened, and this code is not usually used. As an example of its use, however, Apple's MobileMe service generates a 402 error ("httpStatusCode:402" in the Mac OS X Console log) if the MobileMe account is delinquent.

HTTP Status Code: 103 - Early Hints

The 103 (Early Hints) informational status code indicates to the client that the server is likely to send a final response with the header fields included in the informational response. Typically, a server will include the header fields sent in a 103 (Early Hints) response in the final response as well. However, there might be cases when this is not desirable, such as when the server learns that the header fields in the 103 (Early Hints) response are not correct before the final response is sent. A client can speculatively evaluate the header fields included in a 103 (Early Hints) response while waiting for the final response. For example, a client might recognize a Link header field value containing the relation type "preload" and start fetching the target resource. However, these header fields only provide hints to the client; they do not replace the header fields on the final response. Aside from performance optimizations, such evaluation of the 103 (Early...

HTTP Status Code: 200 - Ok

The request has succeeded. The 200 (OK) status code indicates that the request has succeeded. The payload sent in a 200 response depends on the request method. For the methods defined by this specification, the intended meaning of the payload can be summarized as: GET a representation of the target resource HEAD the same representation as GET, but without the representation data; POST a representation of the status of, or results obtained from, the action; PUT DELETE a representation of the status of the action; OPTIONS a representation of the communications options; TRACE a representation of the request message as received by the end server. Aside from responses to CONNECT, a 200 response always has a payload, though an origin server MAY generate a payload body of zero length. If no payload is desired, an origin server ought to send 204 No Content instead. For CONNECT, no payload is allowed because the successful result is a tunnel, which begin...

HTTP Status Codes

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