What does the 'Location' response header contain in a 301 response?

The 'Location' response header in a 301 response indicates the URL where the requested resource has been permanently moved. When a client, such as a web browser, receives a 301 status code, it understands that the resource is no longer available at the original URL and that it should be redirected to the new location specified in the 'Location' header. This is crucial for maintaining a seamless user experience because it allows users and search engines to find the content at its new address without encountering errors.

In contrast, the other options relate to different aspects of HTTP headers. For instance, the type of content is identified by the 'Content-Type' header, character sets are dealt with through the 'Accept-Charset' header, and caching policies are specified by headers such as 'Cache-Control' or 'Expires'. Each of these headers serves a different purpose in the context of HTTP communication, reinforcing that the 'Location' header is distinct in its role of guiding clients to a new URL following a permanent redirect.