Error:
Dont use solution 2 & 3 together, in this way settings will be implemented twice & it will give same error.
Access to XMLHttpRequest at
'http://core/api/test/filter?id=0' from origin
'http://test.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: The 'Access-Control-Allow-Origin' header contains multiple values 'http://testcom, ,', but only one is allowed.
'http://test.com' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: The 'Access-Control-Allow-Origin' header contains multiple values 'http://testcom, ,', but only one is allowed.
Solutions:
1.
Temporary solution for testing or development
purpose: Disable web security by following command.
Open Run --> Type Following Command
‘chrome.exe --user-data-dir="C://Chrome dev session"
--disable-web-security’
New chrome will
open, run your website or application in this browser. It will work fine.
Browser will look like this:
|
2.
When Issue occurred on Server: Add custom header
& following settings in web config file in <system.webServer> section:
<httpProtocol>
<customHeaders>
<add
name="Access-Control-Allow-Origin" value="," />
<add
name="Access-Control-Allow-Headers" value="*" />
<add
name="Access-Control-Allow-Methods" value="GET, HEAD, POST,
PUT, DELETE, OPTIONS" />
</customHeaders>
</httpProtocol>
|
3.
In Startup.cs: add following settings in
// This method gets
called by the runtime. Use this method to configure the HTTP request
pipeline.
public void Configure(IApplicationBuilder
app, IHostingEnvironment env)
{
using (var serviceScope =
app.ApplicationServices.CreateScope())
{
var context =
serviceScope.ServiceProvider.GetRequiredService<DBContext>();
context.Database.Migrate();
}
app.UseCors(options =>
options.WithOrigins("http://test.com").AllowAnyMethod().AllowAnyHeader().AllowCredentials().AllowAnyOrigin());
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseMvc();
}
Add url, where you are
consuming these webApi. So it will allow CORS.
|
Dont use solution 2 & 3 together, in this way settings will be implemented twice & it will give same error.
Hope this article will help you to sort out this issue. In case of any query or further issue, you can comment
in comment section below.
in comment section below.
