I'm trying to fetch the list of official images from docker hub using v2 api. If I try to do curl or use postman, I get the response correctly, but when I try to fetch the list using angularjs service, I get the following error
XMLHttpRequest cannot load https://hub.docker.com/v2/repositories/library/?page=8&page_size=15. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://run.plnkr.co' is therefore not allowed access.
Can someone suggest solution for this. How can I enable cors for this?
CORS could be enabled on the server side, and this is not your case. What you could do is :
1) use a proxy, for instance NGNIX, and make Sure that all request Made to localhost/whatever are redirected to hub.docker.com . This way you can "cheat" Cross-origin block
2) if you need a temporary and dirty solution you could more simply install chrome/safari plugins to bypass CORS security check
There is only one way to bypass CORS is send request through a cors proxy like http://crossorigin.me
It's an opensource project and you can build your own proxy server by download the full source code from here: https://github.com/technoboy10/crossorigin.me
Reason behind the issue :
As per my understanding you are doing an AJAX call to a different domain than your page is on. So, the browser is blocking it for security reasons as it usually allows a request in the same origin.A tutorial about how to achieve that is using CORS.
When you are using curl or postman they are not restricted by this policy. Quoted from Cross-Origin XMLHttpRequest:
Regular web pages can use the XMLHttpRequest object to send and receive data from remote servers, but they're limited by the same origin policy. Extensions aren't so limited. An extension can talk to remote servers outside of its origin, as long as it first requests cross-origin permissions.
Related
I'm a n00b trying to learn React. I'm building a website that uses Etsy's APIs. Registered an app there and everything. They have a page that talks about CORS and proxying here: https://www.etsy.com/developers/documentation/getting_started/jsonp
So for example, I'm trying to do a fetch on a store's listings:
fetch('https://openapi.etsy.com/v2/shops/[shopId]/listings/active?api_key=[apiKey]')
But that violates the browser's CORS policy. No problem, says the documentation on Etsy. You can always use their proxy: beta-api.etsy.com. So I add that to my package.json file:
"proxy": "https://beta-api.etsy.com/"
And then I change my fetch line:
fetch('/v2/shops/[shopId]/listings/active?api_key=[apiKey]')
But CORS is still being violated in the browser.
Access to fetch at 'https://www.etsy.com/shop/beta-api/v2/shops/[shopId]/listings/active?api_key=[apiKey]' (redirected from 'http://localhost:3000/v2/shops/[shopId]/listings/active?api_key=[apiKey]') 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.
I don't want an opaque response, either, so doing "no-cors" really doesn't help. Does anyone have any recommendations on how I can at least get a local website up and running?
You are getting that error because your server has set Access-Control-Allow-Origin to restrict cross-domain traffic. You are sending your request from your localhost so that is considered cross-domain.
If you are able to change your server settings to set Access-Control-Allow-Origin: * then you can make those requests without a CORS error but I don't suggest doing this.
The best solution would probably be a proxy server. You can use cors-anywhere heroku app to easily do this.
Excerpt from Medium Article on this issue
The cors-anywhere server is a proxy that adds CORS headers to a
request. A proxy acts as an intermediary between a client and server.
In this case, the cors-anywhere proxy server operates in between the
frontend web app making the request, and the server that responds with
data.
Similar to the Allow-control-allow-origin plugin, it adds the
more open Access-Control-Allow-Origin: * header to the response.
Say your frontend is trying to make a GET request to:
https://joke-api-strict-cors.appspot.com/jokes/random
But this api does not have a Access-Control-Allow-Origin value
in place that permits the web application domain to access it.
So instead, send your GET request to:
https://cors-anywhere.herokuapp.com/https://joke-api-strict-cors.appspot.com/jokes/random
The proxy server receives the
https://joke-api-strict-cors.appspot.com/jokes/random
from the url above. Then it makes the request to get that server’s
response. And finally, the proxy applies the Access-Control-Allow-
Origin: * to that original response.
I have react app what I already deployed to the GitHub Pages.
But now I have a problem: what I am requesting auth status to server and didn`t get any response. What is the problem?
I have this error in console about my requests
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
GitHub pages supports CORS since 2015, so you can follow "Fix CORS Error| React Tutorial" which points to:
"Run Chrome browser without CORS" (not recommended, just for testing)
axios/axios issue 853
That last issue mentions:
cURL does not enforce CORS rules. Those rules are enforced by browsers for security purposes.
When you mention that you added the relevant header, I assume you mean you added those headers to the request.
Actually, the header is expected in the response headers from the server, indicating that the resource is allowed to be accessed by other websites directly.
FYI, CORS - Cross Origin Resource Sharing. Since your API does not support it, you have two options -
Use a proxy server on the same domain as your webpage to access 4chan's API or,
Use a proxy server on any other domain, but modify the response to include the necessary headers.
I want to be able to make a get request with axios to the google places api with an url like the following below
https://maps.googleapis.com/maps/api/place/textsearch/json?query=pizza+&type=restaurant&location=-21.8029127,142.9766041&radius=10000&key=MYAPIKEY
But I get a CORS error.
So I've scoured to try find how to achieve this and I cant seem to find a simple solution. I don't want any maps or autocomplete functionality that the current npm libraries offer. I just want to be able to get results from the places api based on the query that is entered by the user.
If you are getting a CORS error, it means that your browser is restricting a cross-origin request originated from your application script. One solution to avoid this is by providing the CORS header. However, you do not have access to the API server to get it. So you could specify the origin in your Google Maps API call using the origin param.
https://maps.googleapis.com/maps/api/place/textsearch/json?query=pizza+&type=restaurant&location=-21.8029127,142.9766041&radius=10000&key=MYAPIKEY&origin=*
Notice that I have provided origin=*. But you could use your own DNS instead of *, in case you have one set up.
Below is a transcript from the Mozilla Web Docs website about cors:
For security reasons, browsers restrict cross-origin HTTP requests initiated from within scripts. For example, XMLHttpRequest and the Fetch API follow the same-origin policy. This means that a web application using those APIs can only request HTTP resources from the same origin the application was loaded from, unless the response from the other origin includes the right CORS headers.
I'm using ReactJs and Axios to send API requests to my server but I keep getting the same error:
Failed to load http://***: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3000' is therefore not allowed access. The response had HTTP status code 400.
I'm trying to perform a POST request. I've also tried to download a Chrome Plugin to allow CORS. It did work for the GET requests, but not working for POST it looks like.
If I try to make requests to https://jsonplaceholder.typicode.com/users it's working fine. So I guess there's something wrong with the server.
My server is using Nginx and is on a CentOS 7 OS.
Q: How is it possible to enable CORS just for my local development (localhost) or specific websites?
EDIT: I have already tried using this config on my Nginx server - without luck: https://enable-cors.org/server_nginx.html
While I can't answer you with some specific code, here's what happens (at least what happened last time I tried Angular and had similar issues):
Before sending any further requests, there'll be a header only OPTIONS HTTP request sent to the server URL. When answering this call, the server is supposed to send a header field Access-Control-Allow-Origin containing a whitelist of domains allowed to do further calls using the API. To whitelist all requests in your dev environment it should be enough to set Nginx to answer with Access-Control-Allow-Origin: *.
For development I use the Firefox extension CORS Everywhere. It modifies all web traffic, to include the correct CORS headers. (It works at least with the somewhat dated Firefox in Opensuse 42.3.)
https://addons.mozilla.org/en-US/firefox/addon/cors-everywhere/
Note, that this subverts a security mechanism of the browser.
For deployment you must configure the server, to send the correct CORS headers. (I did never do this, the finished website is planned to work in a single IP.)
If you have access to the server and the server is using Nodejs, this should work for you:
CD into your server folder:
cd server-folder
Then run this command in order to install the 'cors' package:
npm install cors
In order to access this package, go into your server file in your IDE and in the next available line:
const cors = require('cors');
Next, add this line to use the middleware (assuming you are using Express):
app.use(cors());
I have an AngularJs website and when I am trying to post data then when I am opening my website without using www then I am getting
Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource
Otherwise, I am not getting any error.
I tried to search and found that I should implement CORS on my backend which is in NodeJs but can anyone please tell me how can I only implement CORS Headers such that for both www and without, it would work but for any other domain trying to access my API must result in preflight error.
I am trying to do this because I read here which-security-risks-do-cors-imply that allowing all domains can increase security overhead for my website which I do not want.
Thanks.
I'm afraid this is not something you can tweak just in your client-side code. In order for cross-origin requests to work, you need to set an http response header: it's the server, who serves the resource, who will need the change, not the client side code from angularJs.
I believe that you should update your question stating what your server side language is and how are you handling http requests in the server side. As far as I know, just adding a header like:
Access-Control-Allow-Origin: http://client.domain.com
In your responses will do the trick. Where client.domain.com is the domain of your client, angularJs application.