Angular 5: Http failure response for (unknown url): 0 Unknown Error in EDGE browser when calling api

Question

I have a angular 5 application which calls a .NET Core 2.0 backend api. Call to the API from the angular service works fine in all browsers (Chrome, Firefox, IE11) but not in EDGE. In EDGE, i am getting the error

Http failure response for (unknown url): 0 Unknown Error.

It is a CROSS ORIGIN CALL and Cors has been enabled in the API as below. Right now i am enabling for any origin

 services.AddCors(options =>
        {
            options.AddPolicy("AllowAllOrigins",
                  builder =>
                  {
                      builder.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod();
                  });
        });

And in Configure method

app.UseCors("AllowAllOrigins");

It works for all browsers except Edge. Appreciate your help.

https://stackoverflow.com/questions/47180634/i-get-http-failure-response-for-unknown-url-0-unknown-error-instead-of-actu — Naga Sai A, May 04 '18 at 02:35
@NagaSaiA, as i have told above, CORS is already enabled and works in all browsers. but not in EDGE :( — Ranjit Krishnan, May 04 '18 at 02:47
For me it works when I start Fiddler.... When inspecting the requests in DevTools it states it is a "200 OK" response gotten "(from cache)" — Bastiaan Linders, Jun 08 '18 at 16:10

score 0 · Answer 1 · answered Jul 18 '18 at 07:29

Got into the same situation - Angular 6, Edge, same error, other browsers worked fine. Using Fiddler worked as a workaround.

Problem was, that my web was running on localhost and Edge enforced different security rules. Once I've tested the web site on different server, it worked like a charm.

Suppose it might be related to this question.

score 0 · Answer 2 · answered Oct 07 '19 at 08:39

Http failure response for (unknown url): 0 Unknown Error.

This error occure due to edge have advanced security as compared to other browser. this is actully Cors issue .

that can be solved in two way->

either you can modify header in server side by adding as Access-Control-Allow-Origin:* or

configure the proxy.conf.json inside the angular make sure when you configured the proxy then its won't show the actual server url in broswer console,

for example , your client url as localhost:3000 and server url where api hosted as www.server.com/api/apiname then in browser console it will show like below

localhost:3000/api/apiname

Angular 5: Http failure response for (unknown url): 0 Unknown Error in EDGE browser when calling api

2 Answers2

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