I have a generated React site I am hosting in an S3 bucket. One of my components attempts to fetch something when loaded: The url I am fetching is an AWS API Gateway. I have enabled CORS there, via the dropdown, with no changes to the default configuration. In my console, for both the remote site and locally during development,
Tag: cors
fetch() unexpected end of input
I am using fetch() to grab data from api server. My error looks like this: Can you please tell me what am I doing wrong. Answer Opaque Responses A response for a no-cors request to a cross-origin resource has a response type of ‘opaque’. If you log the response before trying to turn it to JSON, you will see a
Text response is empty when using fetch
The following code: is outputting: If I use curl: I get a token in text form back (length != 0). And if I output the response header via: I get: Why am I getting no text via fetch? Answer Remove mode: ‘no-cors’. When you use no-cors mode, you’re explicitly specifying that you want an “opaque response”. Your script can’t access
‘Access-Control-Allow-Origin’ issue when API call made from React (Isomorphic app)
I’m running into an issue with my isomorphic JavaScript app using React and Express. I am trying to make an HTTP request with axios.get when my component mounts I am getting a status 200 res from the API, but I am not getting any response data and getting an error in my console However, if I make the request in
CORS on golang server & javascript fetch frontend
I have a golang HTTP server with code like: I call this HTTP endpoint from a JS frontend, a react app deployed on port 3000, using code: The above code fails with the following logs. On the server side: On the browser, in the developer tools logs: Can someone help fix the authentication problem ? I am not sure if
Catching ‘Origin is not allowed by Access-Control-Allow-Origin’ error
So, i want to detect/catch Cross-Domain access blocked error. After some thought i found out that it src loading is async & thus the catch block wont work. Is there any way to detect the error so i can handle it efficiently? Answer As @TamasHegedus commented, the image can still be loaded with the CORS error, but it doesn’t allow
Cannot access Wikidata API
I’m trying to use the Wikidata API, but all I’m getting is: Fetch API cannot load https://www.wikidata.org/w/api.php?action=wbsearchentities&search=Ingmar%20Bergman&language=en&limit=20&format=json&origin=http%3A%2F%2Fwww.dev.example.com%3A3000. Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘http://www.dev.example.com:3000’ is therefore not allowed access. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with
XMLHttpRequest cannot load XXX No ‘Access-Control-Allow-Origin’ header
tl;dr; About the Same Origin Policy I have a Grunt process which initiates an instance of express.js server. This was working absolutely fine up until just now when it started serving a blank page with the following appearing in the error log in the developer’s console in Chrome (latest version): XMLHttpRequest cannot load https://www.example.com/ No ‘Access-Control-Allow-Origin’ header is present on
Solve Cross Origin Resource Sharing with Flask
For the following ajax post request for Flask (how can I use data posted from ajax in flask?): I get a Cross Origin Resource Sharing (CORS) error: I tried solving it in the two following ways, but none seems to work. Using Flask-CORS This is a Flask extension for handling CORS that should make cross-origin AJAX possible. http://flask-cors.readthedocs.org/en/latest/ How to
Request header field Access-Control-Allow-Headers is not allowed by Access-Control-Allow-Headers
I’m trying to send files to my server with a post request, but when it sends it causes the error: Request header field Content-Type is not allowed by Access-Control-Allow-Headers. So I googled the error and added the headers: Then I get the error: Request header field Access-Control-Allow-Origin is not allowed by Access-Control-Allow-Headers So I googled that and the only similar