CORS: Azure Functions and Blazor


Access to fetch at 'http://localhost:7071/api/' from origin 'https://localhost:44361' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

For v3+ the following works:

p.s. note that location of Hosts is on the same level as Values and not under it

Configure CORS in the local settings file local.settings.json:

  "Values": {
  "Host": {
    "CORS": "*"

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