When I try fetch data from localhost:5000 (my api is at localhost:8080) i have an error:
Fetch API cannot load http://localhost:5000/users/1. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8080' 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 CORS disabled.
I know that i must add header Access-Control-Allow-Origin: * but i don't know where.
I'm using JS+Python (ReactJS and Flask frameworks)
You will have to add in your web server whichever you're using ; provided that you are taking security risk.
Related
I have a website which is using the Vue.js framework which connects to a django api.
The django api has the following settings:
MIDDLEWARE = [
..
"corsheaders.middleware.CorsMiddleware",
..
]
CORS_ALLOWED_ORIGINS = ["http://localhost:3000", 'http://127.0.0.1:3000']
The following request works fine:
fetch("http://127.0.0.1:8000/select?user_sent=1")
However this request causes an error:
fetch("http://127.0.0.1:8000/select?user_sent=2")
The error caused by the second request:
Access to fetch at 'http://127.0.0.1:8000/select?user_sent=2' from origin 'http://localhost:3000' 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.
The weird thing is that the second request used to work before. I made a change to my django urls and changed the name of the select path but then changed it back to select and now it is no longer working.
I tried changing the name of the select path to /sele and when I do that the request will work fine on the new path. However, I would like to know why it is not working on the /select path.
I want to fetch a information from steam web api's 'GetFriendsList' endpoint.When I am using fetch to do this from my front end javascript file.Im getting an error.
Access to fetch at 'https://api.steampowered.com/ISteamUser/GetFriendList/v1/?key=<apikey>&steamid=76561198364464404' from origin 'http://localhost:3001' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: 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.
I went to mdn and saw I must use
Access-Control-Allow-Origin: http://localhost:3000
Vary: Origin
in the fetch option.I did add these and no difference same error,I also added
mode: 'no-cors'
It worked this time but no response was returned from the steam web api.
I am really new to this.This is the first time using fetch.Any help regarding this is appriciated.THANK YOU.
I'm writing totally simple JS code to connect to the Evernote sandbox, which is pretty the same as the one in the documentation:
const Evernote = require("evernote");
const client = new Evernote.Client({
token: "here-is-my-developer-token1234",
sandbox: true
});
const userStore = client.getUserStore();
userStore.getUser().then(function(user) {
console.log(user)
});
Though, I get an error about the CORS policy, which, I suppose, means that my authentification failed for some reason:
Access to fetch at 'https://sandbox.evernote.com//edam/user' from origin 'http://127.0.0.1:5500' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: 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.
I've got my token from there: https://sandbox.evernote.com/api/DeveloperToken.action
Perhaps there is something basic I'm missing. Any guidance would be appreciated.
As you can see in JS SDK docs, they do not support CORS, that is, header authentification as well. So you will need to use oauth.
I'm trying to upload an image to imgur with js (browser) and get a CORS error:
Access to XMLHttpRequest at 'https://api.imgur.com/3/upload' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
But preflight request contains Access-Control-Allow-Origin header:
The request itself:
What I'm missing? this is because access-control-allow-credentials set to true?
The problem was with their API Docs :\
The URL is: https://api.imgur.com/3/image and not https://api.imgur.com/3/upload as said here: https://apidocs.imgur.com/#c85c9dfc-7487-4de2-9ecd-66f727cf3139
according to doc https://api.imgur.com/3/upload doesnt have necessary
header ,
but on the right side ,the curl example use https://api.imgur.com/3/image has Access-Control-Allow-Origin header
and somehow they will check your referer, which means if you are in develop mode like webpack dev mode use localhost:8000 it will always return 429 too many request exception
I am currently using yahoo weather api to fetch weather data. I am getting below error. Please help.
Access to fetch at 'https://weather-ydn-yql.media.yahoo.com/forecastrss?location=sunnyvale,ca&format=json' from origin 'http://localhost:3000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: 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.
I have tried to do google, but none of solution worked for me
You can set the request mode to 'no-cors' like so:
fetch(url, {
mode: "no-cors",
...
})
But, as goto1 described in the comment below, it will usually not be the solution you are looking for (see his comment on how to properly work with CORS).
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
So, First of all you have to change your CORS from browser :
Here is the Link of that , download it and it will install by it self.
visit:https://chrome.google.com/webstore/detail/moesif-origin-cors-change/digfbfaphojjndkpccljibejjbppifbc?hl=en-US
Name : Moesif Origin & CORS Changer
NOTE: Make sure it turns ON while you running your page.