HTTP Status Code 426 – Upgrade Required

The server understands and is willing to comply with the client’s request, via the Upgrade header field, for a change in the application protocol being used on this connection. The server MUST generate an Upgrade header field in the response that indicates which protocol(s) will be switched to immediately after the empty line that terminates…

The 402 (Payment Required) status code is reserved for future use.

Due care and due diligence are security concepts that are closely related. Due care is using reasonable care to protect the interests of an organization. An example of due care is having management create a formalized security structure for the organization that contains various documentation such as baselines, guidelines, and security policies. On the other…

Separation of duties prevents one person from having the ability to take over vital security mechanisms. This is accomplished by dividing work among several people. Limiting the power to individuals makes it so that employees have to work with others to accomplish specific tasks. This security concepts limits potential impact to organizations in areas such…

The request was successful but the enclosed payload has been modified from that of the origin server’s 200 OK response by a transforming proxy. This status code allows the proxy to notify recipients when a transformation has been applied, since that knowledge might impact later decisions regarding the content. For example, future cache validation requests for the…

The request could not be completed due to a conflict with the current state of the target resource. This code is used in situations where the user might be able to resolve the conflict and resubmit the request. The server SHOULD generate a payload that includes enough information for a user to recognize the source…