XMLHttpRequest cannot load URL. Response for preflight has invalid HTTP status code 405
Question
Doing a simple POST with jquery ajax to an IIS vb.net webservice
<html>
<head>
<script type="text/javascript" src="./js/jquery-3.1.1.min.js"></script>
<script type="text/javascript" src="./js/json-2.4.min.js"></script>
<script type="text/javascript" src="./js/util.js"></script>
</head>
<body>
<script type='text/javascript'>
var myKeyVals = { userid : "USERID", password : "password", gkey : "key"}
$.ajax({
url: "myurl",
type: "POST",
data: JSON.stringify(myKeyVals),
contentType: "application/json",
cache: false,
success: function( data, textStatus, jQxhr ){
alert(JSON.stringify(data))
},
error: function( jqXhr, textStatus, errorThrown ){
alert("error")
}
});
</script>
</body>
</html>
It seems to be working with IE but Chrome and Firefox throw the
"XMLHttpRequest cannot load url. Response for preflight has invalid HTTP status code 405" error
My web.config has
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Allow-Headers" value="Origin, X-Requested-With, Content-Type, Accept,Authorization" />
<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
</customHeaders>
and also
<handlers>
<remove name="OPTIONSVerbHandler" />
<add name="OPTIONSVerbHandler" path="*" verb="*" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="None" preCondition="bitness32" />
</handlers>
as per numerous other posts.
1 answers
solution1
0 ACCPTED 2017-05-30 17:05:25
So In my case I didn't have a global.asax so I needed to create one by right clicking on my project and adding a new item. From there you can add a Global.asax. Within the Global.asax I had to do the following in the BeginRequest sub
Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs)
'HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
If HttpContext.Current.Request.HttpMethod = "OPTIONS" Then
HttpContext.Current.Response.AddHeader("Cache-Control", "no-cache")
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST")
HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept")
HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000")
HttpContext.Current.Response.End()
End If
End Sub
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