HTTP Status Code 400 – Bad Request

The initial part of a request has been received and has not yet been rejected by the server. The server intends to send a final response after the request has been fully received and acted upon. When the request contains an Expect header field that includes a 100-continue expectation, the 100 response indicates that the…

The server encountered an unexpected condition that prevented it from fulfilling the request.

Administrative controls are the policies and procedures defined by an organization’s security policy and other regulations or requirements. These controls focus on personnel and business practices. Examples: policies, procedures, hiring practices, background checks, employee training.

The target resource does not have a current representation that would be acceptable to the user agent, according to the proactive negotiation header fields received in the request, and the server is unwilling to supply a default representation. The server SHOULD generate a payload containing a list of available representation characteristics and corresponding resource identifiers…

The server understands the content type of the request entity (hence a 415 Unsupported Media Type status code is inappropriate), and the syntax of the request entity is correct (thus a 400 Bad Request status code is inappropriate) but was unable to process the contained instructions. For example, this error condition may occur if an XML request body contains…

The server, while acting as a gateway or proxy, received an invalid response from an inbound server it accessed while attempting to fulfill the request.