来自 QlikView 扩展对象的 jquery ajax 请求发送 OPTION 而不是 GET在 Fiddler 中检查

如何解决来自 QlikView 扩展对象的 jquery ajax 请求发送 OPTION 而不是 GET在 Fiddler 中检查

我在从 QlikView 自定义对象对 Web 服务进行 jQuery ajax 调用时遇到问题。 ajax 调用成功地从浏览器以及从 fiddler 和 POSTMAN 到 Web 服务。

检查 fiddler 后，我发现请求是“OPTION”而不是“GET”。响应为 200 OK，但未调用 webservice 方法。感谢您在这方面的任何帮助。

$.ajax({
    cors: true,beforeSend: function (xhr) {
         xhr.setRequestHeader('Content-type','appliction/json; charset=utf-8');
         xhr.setRequestHeader('crossDomain',true);
         xhr.setRequestHeader('cors',true );
         xhr.setRequestHeader('Access-Control-Allow-Origin','http://qlikview');
         },url: "http://localhost:56915/DBWrite/DBWriteMainService.svc/TestService",type: "GET",cache: false,//data: JSON.stringify(data),contentType: "application/json; charset=utf-8",crossDomain: true,dataType: "JSON",//processData: false,xhrFields: { withCredentials: true },success: function (response) { alert(response);},//failure: function (errorMsg) {alert("error"+errorMsg);} 
error: function (xhr,status,error) { 
var errorMessage = xhr.status + ': ' + xhr.statusText;
alert('Error - ' + errorMessage);}
});

来自 fiddler 的请求标头：

OPTIONS /DBWriteMainService.svc/TestService?_=1620838978068 HTTP/1.1
Accept: */*
Origin: http://qlikview
Access-Control-Request-Method: GET
Access-Control-Request-Headers: content-type,accept,crossdomain,cors,access-control-allow-origin
UA-cpu: AMD64
Accept-Encoding: gzip,deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.2; Win64; x64; Trident/7.0; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.30729; Tablet PC 2.0; wbx 1.0.0; wbxapp 1.0.0; Zoom 3.6.0)
Host: localhost:56915
Content-Length: 0
Connection: Keep-Alive
Pragma: no-cache

来自 fiddler 的响应标题：

HTTP/1.1 200 OK
Server: Microsoft-IIS/10.0
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,POST,OPTIONS
Access-Control-Allow-Headers: Authorization,Origin,Content-Type,Accept,X-Requested-With
X-SourceFiles: =?UTF-8?B?QzpcVXNlcnNcc21haGFwYTNcT25lRHJpdmUgLSBBbmFsb2cgRGV2aWNlcywgSW5jXERlc2t0b3Bcd2JcREJXcml0ZVRlc3RcREJXcml0ZVRlc3RcREJXcml0ZU1haW5TZXJ2aWNlLnN2Y1xUZXN0U2VydmljZQ==?=
X-Powered-By: ASP.NET
Access-Control-Allow-Origin: *
Access-Control-Allow-Headers: Content-Type
Date: Wed,12 May 2021 17:03:12 GMT
Content-Length: 0