CORS Anywhere is a reverse proxy which adds CORS headers to the proxied request. Request URL is taken from the path
CORS Anywhere is a NodeJS proxy which adds CORS headers to the proxied request.
The url to proxy is literally taken from the path, validated and proxied. The protocol part of the proxied URI is optional, and defaults to "http". If port 443 is specified, the protocol defaults to "https".
This package does not put any restrictions on the http methods or headers, except for cookies. Requesting user credentials is disallowed. The app can be configured to require a header for proxying a request, for example to avoid a direct visit from the browser.
The package also includes a Procfile, to run the app on Heroku. More information about Heroku can be found at https://devcenter.heroku.com/articles/nodejs.
// Heroku defines the environment variable PORT, and requires the binding address to be 0.0.0.0var host = processenvPORT ? '0.0.0.0' : '127.0.0.1';var port = processenvPORT || 8080;var cors_proxy = require'cors-anywhere';cors_proxycreateServerrequireHeader: 'origin' 'x-requested-with'removeHeaders: 'cookie' 'cookie2'listenport hostconsole.log'Running CORS Anywhere on ' + host + ':' + port;;
http://localhost:8080/http://google.com/- Google.com with CORS headers
http://localhost:8080/google.com- Same as previous.
http://localhost:8080/- Shows usage text, as defined in
http://localhost:8080/favicon.ico- Replies 404 Not found
If you want to automatically enable cross-domain requests when needed, use the following snippet:
var cors_api_host = 'cors-anywhere.herokuapp.com';var cors_api_url = 'https://' + cors_api_host + '/';var slice = slice;var origin = windowlocationprotocol + '//' + windowlocationhost;var open = XMLHttpRequestprototypeopen;var args = slicecallarguments;var targetOrigin = /^https?:\/\//iexecargs1;if targetOrigin && targetOrigin0toLowerCase !== origin &&targetOrigin1 !== cors_api_hostargs1 = cors_api_url + args1;return openapplythis args;;;
If you're using jQuery, you can also use the following code instead of the previous one:
jQueryajaxPrefilterif optionscrossDomain && jQuerysupportcorsoptionsurl = '' + optionsurl;;
The module exports two properties:
getHandler(options)returns a handler which implements the routing logic. This handler is used by http-proxy.
createServer(options)creates a server with the default handler.
The following options are recognized by both methods:
requireHeader- If set, the request must include this header or the API will refuse to proxy.
removeHeaders- Exclude certain headers from being included in the request.
createServer recognizes the following option as well:
httpProxyOptions- Options for http-proxy. The documentation for these options can be found here.
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