ServicePoint.Expect100Continue Property
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Gets or sets a Boolean value that determines whether 100-Continue behavior is used.
public:
property bool Expect100Continue { bool get(); void set(bool value); };public bool Expect100Continue { get; set; }member this.Expect100Continue : bool with get, setPublic Property Expect100Continue As BooleanProperty Value
true to expect 100-Continue responses for POST requests; otherwise, false. The default value is true.
Examples
The following code example displays the value of this property.
Console::WriteLine( "UseNagleAlgorithm = {0} ", sp->UseNagleAlgorithm.ToString() );
Console::WriteLine( "Expect 100-continue = {0}", sp->Expect100Continue.ToString() );
Console.WriteLine("UseNagleAlgorithm = " + sp.UseNagleAlgorithm.ToString());
Console.WriteLine("Expect 100-continue = " + sp.Expect100Continue.ToString());
Console.WriteLine("UseNagleAlgorithm = " + sp.UseNagleAlgorithm.ToString())
Console.WriteLine("Expect 100-continue = " + sp.Expect100Continue.ToString())
Remarks
Caution
WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete, and you shouldn't use them for new development. Use HttpClient instead.
When this property is set to true, client requests that use the POST method expect to receive a 100-Continue response from the server to indicate that the client should send the data to be posted. This mechanism allows clients to avoid sending large amounts of data over the network when the server, based on the request headers, intends to reject the request.
For example, assume the Expect100Continue property is false. When the request is sent to the server, it includes the data. If, after reading the request headers, the server requires authentication and sends a 401 response, the client must resend the data with proper authentication headers.
If the Expect100Continue property is true, the request headers are sent to the server. If the server has not rejected the request, it sends a 100-Continue response signaling that the data can be transmitted. If, as in the preceding example, the server requires authentication, it sends the 401 response and the client has not unnecessarily transmitted the data.
Changing the value of this property does not affect existing connections. Only new connections created after the change are affected.
The Expect 100-Continue behavior is fully described in IETF RFC 2616 Section 10.1.1.
