Sys.Net.WebRequest, classe
Mise à jour : novembre 2007
Fournit les fonctionnalités de script client nécessaires à toute requête Web.
Espace de noms :Sys.Net
Hérite : Aucun
var wRequest = new Sys.Net.WebRequest();
Constructeurs
Nom |
Description |
|---|---|
Initialise une nouvelle instance de la classe WebRequest. |
Membres
Nom |
Description |
|---|---|
Inscrit un gestionnaire d'événements à associer à l'instance de la requête Web. |
|
Déclenche l'événement terminé pour l'instance Sys.Net.WebRequest associée. |
|
Obtient l'URL résolue de l'instance de la requête Web. |
|
Émet un appel réseau pour l'instance de requête Web. |
|
Supprime le gestionnaire d'événements associé à l'instance de requête Web. |
|
Obtient ou définit le corps HTTP de la requête Web. |
|
Obtient ou définit l'exécuteur de l'instance de requête Web associée. |
|
Obtient les en-têtes HTTP pour la requête Web. |
|
Obtient ou définit le verbe HTTP de requête Web pour émettre la requête Web. |
|
Obtient ou définit la valeur du délai d'attente pour l'instance de requête Web. |
|
Obtient ou définit l'URL de l'instance de requête Web. |
|
Obtient ou définit le contexte d'utilisateur associé à l'instance de requête Web. |
Notes
La classe WebRequest est utilisée par les classes de la couche de communication asynchrone pour effectuer une requête Web. En général, vous n'utilisez pas directement ce type dans vos applications. Vous appelez plutôt à partir du navigateur des méthodes de service Web Service ou des méthodes de page statique à l'aide des méthodes proxy. Pour plus d'informations, consultez Exposition de services Web au script client.
Toutefois, vous pouvez créer et utiliser une instance WebRequest pour les scénarios suivants :
lorsque vous souhaitez effectuer des requêtes réseau qui ne sont pas de simples appels de méthode de service Web ;
lorsque vous souhaitez définir directement des propriétés de requête HTTP ;
lorsque vous utilisez un exécuteur personnalisé basé sur la classe Sys.Net.WebRequestExecutor.
Exemple
L'exemple suivant indique comment créer une instance de la classe WebRequest pour effectuer une requête Web GET. L'exemple comprend une page Web et le script client utilisé pour interagir avec la classe WebRequest.
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title> Using WebRequest </title>
<style type="text/css">
body { font: 11pt Trebuchet MS;
font-color: #000000;
padding-top: 72px;
text-align: center }
.text { font: 8pt Trebuchet MS }
</style>
</head>
<body>
<h2>Using WebRequest</h2>
<form id="form1" runat="server">
<asp:ScriptManager runat="server" ID="ScriptManagerId">
<Scripts>
<asp:ScriptReference Path="WebRequest.js" />
</Scripts>
</asp:ScriptManager>
</form>
<table>
<tr align="left">
<td>Make GET Request:</td>
<td>
<button id="Button1"
onclick="GetWebRequest()">GET</button>
</td>
</tr>
<tr align="left">
<td>Request Body:</td>
<td>
<button id="Button2"
onclick="PostWebRequest()">Body</button>
</td>
</tr>
<tr align="left">
<td>Request Timeout:</td>
<td>
<button id="Button3"
onclick="WebRequestTimeout()">Timeout</button>
</td>
</tr>
<tr align="left">
<td>Request Completed Handler:</td>
<td>
<button id="Button4"
onclick="WebRequestCompleted()">Completed Handler</button>
</td>
</tr>
<tr align="left">
<td>Resolved Url:</td>
<td>
<button id="Button5"
onclick="GetWebRequestResolvedUrl()">Resolved Url</button>
</td>
</tr>
<tr align="left">
<td>Request Executor:</td>
<td>
<button id="Button6"
onclick="WebRequestExecutor()">Executor</button>
</td>
</tr>
<tr align="left">
<td>Request Header:</td>
<td>
<button id="Button7"
onclick="WebRequestHeader()">Header</button>
</td>
</tr>
</table>
<hr />
<div id="ResultId" style="background-color:Aqua;"></div>
</body>
</html>
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title> Using WebRequest </title>
<style type="text/css">
body { font: 11pt Trebuchet MS;
font-color: #000000;
padding-top: 72px;
text-align: center }
.text { font: 8pt Trebuchet MS }
</style>
</head>
<body>
<h2>Using WebRequest</h2>
<form id="form1" runat="server">
<asp:ScriptManager runat="server" ID="ScriptManagerId">
<Scripts>
<asp:ScriptReference Path="WebRequest.js" />
</Scripts>
</asp:ScriptManager>
</form>
<table>
<tr align="left">
<td>Make GET Request:</td>
<td>
<button id="Button1"
onclick="GetWebRequest()">GET</button>
</td>
</tr>
<tr align="left">
<td>Request Body:</td>
<td>
<button id="Button2"
onclick="PostWebRequest()">Body</button>
</td>
</tr>
<tr align="left">
<td>Request Timeout:</td>
<td>
<button id="Button3"
onclick="WebRequestTimeout()">Timeout</button>
</td>
</tr>
<tr align="left">
<td>Request Completed Handler:</td>
<td>
<button id="Button4"
onclick="WebRequestCompleted()">Completed Handler</button>
</td>
</tr>
<tr align="left">
<td>Resolved Url:</td>
<td>
<button id="Button5"
onclick="GetWebRequestResolvedUrl()">Resolved Url</button>
</td>
</tr>
<tr align="left">
<td>Request Executor:</td>
<td>
<button id="Button6"
onclick="WebRequestExecutor()">Executor</button>
</td>
</tr>
<tr align="left">
<td>Request Header:</td>
<td>
<button id="Button7"
onclick="WebRequestHeader()">Header</button>
</td>
</tr>
</table>
<hr />
<div id="ResultId" style="background-color:Aqua;"></div>
</body>
</html>
var getPage;
var postPage;
var displayElement;
function pageLoad()
{
getPage = "getTarget.htm";
postPage = "postTarget.aspx";
displayElement = $get("ResultId");
}
// This function performs a GET Web request
// to retrieve information from the Url specified in
// the query string.
function GetWebRequest()
{
alert("Performing Get Web request.");
// Instantiate the WebRequest object.
var wRequest = new Sys.Net.WebRequest();
// Set the request Url.
wRequest.set_url(getPage);
// Set the request verb.
wRequest.set_httpVerb("GET");
// Set user's context
wRequest.set_userContext("user's context");
// Set the web request completed event handler,
// for processing return data.
wRequest.add_completed(OnWebRequestCompleted);
// Clear the results page element.
displayElement.innerHTML = "";
// Execute the request.
wRequest.invoke();
}
// This function performs a POST Web request
// to upload information to the resource
// identified by the Url.
function PostWebRequest()
{
// Instantiate the WebRequest object.
var wRequest = new Sys.Net.WebRequest();
// Set the request Url.
wRequest.set_url(postPage);
// Set the request verb.
wRequest.set_httpVerb("POST");
var body = "Message=Hello! Do you hear me?"
wRequest.set_body(body);
wRequest.get_headers()["Content-Length"] = body.length;
// Set the web request completed event handler,
// for processing return data.
wRequest.add_completed(OnWebRequestCompleted);
// Clear the results page element.
displayElement.innerHTML = "";
// Execute the request.
wRequest.invoke();
}
// This function adds and removes the
// Web request completed event handler.
function WebRequestCompleted()
{
// Instantiate the WebRequest.
var wRequest = new Sys.Net.WebRequest();
// Set the request Url.
wRequest.set_url(getPage);
// Set the web request completed event handler,
// for processing return data.
wRequest.add_completed(OnWebRequestCompleted);
alert("Added Web request completed handler");
// Remove the web request completed event handler.
// Comment the following two lines if you want to
// use the handler.
wRequest.remove_completed(OnWebRequestCompleted);
alert("Removed handler; the Web request return is not processed.");
// Execute the request.
wRequest.invoke();
}
// This function gets the resolved Url
// of the Web request instance.
function GetWebRequestResolvedUrl()
{
// Instantiate the WebRequest.
var wRequest = new Sys.Net.WebRequest();
// Set the request Url.
wRequest.set_url(getPage);
// Get the web request completed event handler.
var resUrl = wRequest.getResolvedUrl();
alert("Resolved Url: " + resUrl);
// Set the web request completed event handler,
// for processing return data.
wRequest.add_completed(OnWebRequestCompleted);
// Execute the request.
wRequest.invoke();
}
// This function gets and sets the
// Web request time out.
function WebRequestTimeout()
{
// Instantiate the WebRequest.
var wRequest = new Sys.Net.WebRequest();
// Set the request Url.
wRequest.set_url(getPage);
var defaultTimeout =
wRequest.get_timeout();
// Set request timeout to 100 msec.
wRequest.set_timeout(100);
var newTimeout =
wRequest.get_timeout();
alert("Default timeout: " + defaultTimeout);
alert("New timeout: " + newTimeout);
// Set the web request completed event handler,
// for processing return data.
wRequest.add_completed(OnWebRequestCompleted);
// Execute the request.
wRequest.invoke();
}
// This function sets the Web request
// executor, replacing the default one.
function WebRequestExecutor()
{
// Instantiate the WebRequest.
var wRequest = new Sys.Net.WebRequest();
// Create the executor. In this case it is an
// XMLHttpExecutor, equivalent to the default
// executor. But, you can create a custom one.
var executor = new Sys.Net.XMLHttpExecutor();
// Set the executor, replacing the default one.
// In this case the executor is equivalent to the
// default one.
wRequest.set_executor(executor);
// Get the current executor
var executor =
wRequest.get_executor();
alert("Response availabe: " + executor.get_responseAvailable())
}
// This function sets an HTTP header for
// the Web request.
function WebRequestHeader()
{
// Instantiate the WebRequest object.
var wRequest = new Sys.Net.WebRequest();
// Set the request Url.
wRequest.set_url(postPage);
// Set the request verb.
wRequest.set_httpVerb("POST");
var body = "Message=Hello! Do you hear me?"
wRequest.set_body(body);
// Set the value of the HTTP header's "Content-Length".
wRequest.get_headers()["Content-Length"] = body.length;
// Set the web request completed event handler,
// for processing return data.
wRequest.add_completed(OnWebRequestCompletedHeader);
// Clear the results page element.
displayElement.innerHTML = "";
// Execute the request.
wRequest.invoke();
}
// This the handler for the Web request completed event
// that is used to display return data.
function OnWebRequestCompleted(executor, eventArgs)
{
if(executor.get_responseAvailable())
{
// Clear the previous results.
displayElement.innerHTML = "";
// Display Web request status.
DisplayWebRequestStatus(executor);
// Display Web request headers.
DisplayWebRequestHeaders(executor);
// Display Web request body.
DisplayWebRequestBody(executor);
}
else
{
if (executor.get_timedOut())
alert("Timed Out");
else
if (executor.get_aborted())
alert("Aborted");
}
}
// This the handler for the Web request completed event
// that is used to display header information.
function OnWebRequestCompletedHeader(executor, eventArgs)
{
if(executor.get_responseAvailable())
{
// Clear the previous results.
displayElement.innerHTML = "";
// Display Web request headers.
DisplayWebRequestHeaders(executor);
}
else
{
if (executor.get_timedOut())
alert("Timed Out");
else
if (executor.get_aborted())
alert("Aborted");
}
}
// This function is used to display the Web request status.
function DisplayWebRequestStatus(executor)
{
displayElement.innerHTML +=
"Status: [" +
executor.get_statusCode() + " " +
executor.get_statusText() + "]" + "<br/>"
}
// This function is used to display Web request HTTP headers.
function DisplayWebRequestHeaders(executor)
{
displayElement.innerHTML +=
"Headers: ";
displayElement.innerHTML +=
executor.getAllResponseHeaders() + "<br/>";
}
// This function is used to display the Web request body.
function DisplayWebRequestBody(executor)
{
displayElement.innerHTML +=
"Body: ";
if (document.all)
displayElement.innerText +=
executor.get_responseData();
else
// Firefox
displayElement.textContent +=
executor.get_responseData();
}
// This function is used to display the Web request message.
function DisplayInformation(message)
{
// Clear the previous results.
displayElement.innerHTML = "";
// Display information.
displayElement.innerHTML = "<br/>" + message;
}
if (typeof(Sys) !== "undefined") Sys.Application.notifyScriptLoaded();