![]() A valid response contains a checksum of the user name, the password, the given nonce value, the HTTP verb, and the requested Uniform Resource Identifier (URI). Uses a base64 encoded string that contains the user name and password.Ĭhallenges using a nonce (a server-specified data string) value. ![]() The following table contains the authentication schemes that are supported by WinHTTP, the authentication type, and a description of the scheme. Challenge-response schemes can take multiple exchanges to complete. The client then resends the request with the proper response to obtain the requested service. After the client selects a challenge-response scheme, the server returns an appropriate status code with a challenge that contains the authentication data for that scheme. In a challenge-response scheme, the username and password are never transmitted over the network. The client transforms the data with the user credentials and sends the transformed data back to the server for authentication.Ĭhallenge-response schemes enable a more secure authentication. The server services the request only if the request is sent with an authorization header that includes a valid user name and password.Ĭhallenge-response schemes, such as Kerberos, in which the server challenges the client with authentication data. The Basic authentication scheme is based on the model that a client must identify itself with a user name and password for each realm. For example, the header "Authorization: Basic " would be added to the request and sent to the server if the client received the response header "There are two general types of authentication schemes:īasic authentication scheme, in which the user name and password are sent in clear text to the server. The authorization header contains the authentication scheme and the appropriate response required by that scheme. For example, the header "An HTTP application can include an authorization header field with a request it sends to the server. ![]() The realm value is case-sensitive and defines a set of servers or proxies for which the same credentials are accepted. Along with the status code, the proxy or server sends one or more authenticate headers: If multiple authentication schemes are supported, the server returns multiple authenticate headers. If authentication is required, the HTTP application receives a status code of 401 (server requires authentication) or 407 (proxy requires authentication). ![]() The Microsoft Windows HTTP Services (WinHTTP) functions support server and proxy authentication for HTTP sessions. Some HTTP servers and proxies require authentication before allowing access to resources on the Internet. ![]()
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