The client application can filter the CA list to retrieve the client certificate for SSL authentication.Īlternately, if the server requests the client certificate, but doesn't require it, the application can call WinHttpSetOption with the WINHTTP_OPTION_CLIENT_CERT_CONTEXT option. The issuer list in the structure contains a list of acceptable Certificate Authorities (CA) from the server. Retrieves a SecPkgContext_IssuerListInfoEx structure when the error from WinHttpSendRequest or WinHttpReceiveResponse is ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED. For more information, see the WINHTTP_OPTION_CLIENT_CERT_ISSUER_LIST option.
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If the server requires a client certificate, it may send a 403 HTTP status code in response. The application provides the WINHTTP_NO_CLIENT_CERT_CONTEXT macro in the lpBuffer parameter of WinHttpSetOption as shown in the following code example. The server can choose another authentication scheme or allow anonymous access to the server. If the server requests the certificate but doesn't require it, the application can specify this option to indicate that it doesn't have a certificate. When the server requests a client certificate, WinHttpSendRequest, or WinHttpReceiveResponse returns an ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED error. The application should not attempt to close the certificate store with the CERT_CLOSE_STORE_FORCE_FLAG flag in the call to CertCloseStore on the certificate store from which the certificate context was retrieved. As a part of processing this option, WinHttp calls CertDuplicateCertificateContext on the caller-provided certificate context so that the certificate context can be independently released by the caller. If an application receives ERROR_WINHTTP_CLIENT_AUTH_CERT_NEEDED, it must call WinHttpSetOption to supply a certificate before retrying the request. Retrieves the pointer to the callback function set with WinHttpSetStatusCallback. This can improve the performance of subsequent requests to the same destination, which won't have the overhead of connection establishment. Then, upon first sending a request, rather than opening only a single connection, WinHttp opens a number of connections in parallel. When you set this option on a session handle, you must pass the number of connections you wish to open. It will not take effect, if you specify the server by "localhost" or IP address.Īn authenticated log on using the default credentials is performed for all requests.Īn authenticated log on using the default credentials is performed only for requests on the local Intranet. Note that this flag takes effect only if you specify the server by the actual machine name. Sets an unsigned long integer value that specifies the Automatic Logon Policy with one of the following values. If used in the prescribed manner, this option may improve performance. If it doesn't follow these guidelines, there is likely to be a negative performance impact or a potential application hang. The client application must take special care to perform minimal operations within the callback without blocking, returning as quickly as possible, and in particular must not wait for any subsequent WinHTTP calls. If set to TRUE, WinHTTP doesn't guarantee progress if status callbacks are blocked by the client application. WINHTTP_OPTION_ASSURED_NON_BLOCKING_CALLBACKS The following option flags are supported by WinHttpQueryOption and WinHttpSetOption.
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