How to enable CORS in flask
Here is what worked for me when I deployed to Heroku. http://flask-cors.readthedocs.org/en/latest/Install flask-cors by running – pip install -U flask-cors
cors
Why does my JavaScript code receive a “No ‘Access-Control-Allow-Origin’ header is present on the requested resource” error, while Postman does not?
If I understood it right you are doing an XMLHttpRequest to a different domain than your page is on. So the browser is blocking it as it usually allows a request in the same origin for security reasons. You need to do something different when you want to do a cross-domain request. A tutorial about how to … Read more
Cross-Origin Read Blocking (CORB)
You are making a JSONP request, but the server is responding with JSON. The browser is refusing to try to treat the JSON as JSONP because it would be a security risk. (If the browser did try to treat the JSON as JSONP then it would, at best, fail). See this question for more details on what JSONP is. … Read more
Cross-Origin Read Blocking (CORB)
I have called third party API using Jquery AJAX. I am getting following error in console: Cross-Origin Read Blocking (CORB) blocked cross-origin response MY URL with MIME type application/json. See https://www.chromestatus.com/feature/5629709824032768 for more details. I have used following code for Ajax call : When I checked in Fiddler, I have got the data in response … Read more
How does Access-Control-Allow-Origin header work?
Access-Control-Allow-Origin is a CORS (Cross-Origin Resource Sharing) header. When Site A tries to fetch content from Site B, Site B can send an Access-Control-Allow-Origin response header to tell the browser that the content of this page is accessible to certain origins. (An origin is a domain, plus a scheme and port number.) By default, Site … Read more
No ‘Access-Control-Allow-Origin’ header is present on the requested resource—when trying to get data from a REST API
This answer covers a lot of ground, so it’s divided into three parts: How to use a CORS proxy to get around “No Access-Control-Allow-Origin header” problems How to avoid the CORS preflight How to fix “Access-Control-Allow-Origin header must not be the wildcard” problems How to use a CORS proxy to avoid “No Access-Control-Allow-Origin header” problems … Read more
Why does my JavaScript code receive a “No ‘Access-Control-Allow-Origin’ header is present on the requested resource” error, while Postman does not?
If I understood it right you are doing an XMLHttpRequest to a different domain than your page is on. So the browser is blocking it as it usually allows a request in the same origin for security reasons. You need to do something different when you want to do a cross-domain request. A tutorial about … Read more