CODEWITHSUNDEEP
.netasp.net-core.net-corevisual-studio-2019
Purushothaman
Purushothaman

Reputation: 579

Getting error as soon as app starts "UriFormatException: Invalid URI: The format of the URI could not be determined" using .Net core 3.1

System.UriFormatException: Invalid URI: The format of the URI could not be determined. at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) at System.Uri..ctor(String uriString) at Microsoft.Identity.Web.AuthorityHelpers.BuildAuthority(MicrosoftIdentityOptions options) at Microsoft.Identity.Web.WebApiAuthenticationBuilderExtensions.<>c__DisplayClass1_0.b__0(JwtBearerOptions options) at Microsoft.Extensions.Options.ConfigureNamedOptions1.Configure(String name, TOptions options) at Microsoft.Extensions.Options.OptionsFactory1.Create(String name) at Microsoft.Extensions.Options.OptionsMonitor1.<>c__DisplayClass11_0.<Get>b__0() at System.Lazy1.ViaFactory(LazyThreadSafetyMode mode) at System.Lazy1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor) at System.Lazy1.CreateValue() at System.Lazy1.get_Value() at Microsoft.Extensions.Options.OptionsCache1.GetOrAdd(String name, Func1 createOptions) at Microsoft.Extensions.Options.OptionsMonitor1.Get(String name) at Microsoft.AspNetCore.Authentication.AuthenticationHandler`1.InitializeAsync(AuthenticationScheme scheme, HttpContext context) at Microsoft.AspNetCore.Authentication.AuthenticationHandlerProvider.GetHandlerAsync(HttpContext context, String authenticationScheme) at Microsoft.AspNetCore.Authentication.AuthenticationService.AuthenticateAsync(HttpContext context, String scheme) at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

Upvotes: 3

Views: 8290

Answers (2)

Just Shadow
Just Shadow

Reputation: 11881

In my case the reason was the missing "https://" in the configs of the appsettings.json file. Just adding it to the instance worked.

Contents of appsettings.json:

{
  "AzureAdB2C": {
    //"Instance": "blah.b2clogin.com", // <- Missing "https://"
    "Instance": "https://blah.b2clogin.com", // <- Fixed version
    "ClientId": "f6fc311c-cf68-4264-9da6-a3aae9727821",
    "Domain": "blah.onmicrosoft.com",
    "SignUpSignInPolicyId": "B2C_1_signupsignin"
  },
  ...
}

Upvotes: 5

Lasanga Guruge
Lasanga Guruge

Reputation: 874

Error usually happens when a string without http:// or https:// is provided as an argument to new Uri(string). To avoid throwing an exception you can use, 

 new Uri(urlString, UriKind.RelativeOrAbsolute);

Upvotes: 0

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