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@@ -20,4 +20,201 @@ There are many options for setting up Strapi, here is an easy workflow that we r
 - Step 2: Copy `/api` from [this repository](https://github.com/poloclub/argo-graph-share) as a reference of the `snapshot` content type that we have set up.
 - Step 3: Follow the [Deployment guide of Strapi](https://strapi.io/documentation/v3.x/getting-started/deployment.html). Among the list of supported hosting providers, Heroku is an easy start (and they have a free tier).
 
-You can use the [Roles and Permissions](https://strapi.io/documentation/v3.x/plugins/users-permissions.html) feature (available in the admin dashboard by default) to set up your own access control. This allows you to set up access control without writing any code.
\ No newline at end of file
+You can use the [Roles and Permissions](https://strapi.io/documentation/v3.x/plugins/users-permissions.html) feature (available in the admin dashboard by default) to set up your own access control. This allows you to set up access control without writing any code.
+
+
+## CORS Anywhere
+
+Argo is using a modified clone of CORS Anywhere to serve as a CORS reverse-proxy. To learn more about the newest version of CORS Anywhere, please read below.
+
+[![Build Status](https://travis-ci.com/Rob--W/cors-anywhere.svg?branch=master)](https://travis-ci.com/Rob--W/cors-anywhere)
+[![Coverage Status](https://coveralls.io/repos/github/Rob--W/cors-anywhere/badge.svg?branch=master)](https://coveralls.io/github/Rob--W/cors-anywhere?branch=master)
+
+**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](http://www.w3.org/TR/cors/#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.
+
+### Example
+
+```javascript
+// Listen on a specific host via the HOST environment variable
+var host = process.env.HOST || '0.0.0.0';
+// Listen on a specific port via the PORT environment variable
+var port = process.env.PORT || 8080;
+
+var cors_proxy = require('cors-anywhere');
+cors_proxy.createServer({
+    originWhitelist: [], // Allow all origins
+    requireHeader: ['origin', 'x-requested-with'],
+    removeHeaders: ['cookie', 'cookie2']
+}).listen(port, host, function() {
+    console.log('Running CORS Anywhere on ' + host + ':' + port);
+});
+
+```
+Request examples:
+
+* `http://localhost:8080/http://google.com/` - Google.com with CORS headers
+* `http://localhost:8080/google.com` - Same as previous.
+* `http://localhost:8080/google.com:443` - Proxies `https://google.com/`
+* `http://localhost:8080/` - Shows usage text, as defined in `lib/help.txt`
+* `http://localhost:8080/favicon.ico` - Replies 404 Not found
+
+Live examples:
+
+* https://cors-anywhere.herokuapp.com/
+* https://robwu.nl/cors-anywhere.html - This demo shows how to use the API.
+
+### Documentation
+
+#### Client
+
+To use the API, just prefix the URL with the API URL. Take a look at [demo.html](demo.html) for an example.
+A concise summary of the documentation is provided at [lib/help.txt](lib/help.txt).
+
+**Note: as of February 2021, access to the demo server requires an opt-in**,
+see: https://github.com/Rob--W/cors-anywhere/issues/301
+
+If you want to automatically enable cross-domain requests when needed, use the following snippet:
+
+```javascript
+(function() {
+    var cors_api_host = 'cors-anywhere.herokuapp.com';
+    var cors_api_url = 'https://' + cors_api_host + '/';
+    var slice = [].slice;
+    var origin = window.location.protocol + '//' + window.location.host;
+    var open = XMLHttpRequest.prototype.open;
+    XMLHttpRequest.prototype.open = function() {
+        var args = slice.call(arguments);
+        var targetOrigin = /^https?:\/\/([^\/]+)/i.exec(args[1]);
+        if (targetOrigin && targetOrigin[0].toLowerCase() !== origin &&
+            targetOrigin[1] !== cors_api_host) {
+            args[1] = cors_api_url + args[1];
+        }
+        return open.apply(this, args);
+    };
+})();
+```
+
+If you're using jQuery, you can also use the following code **instead of** the previous one:
+
+```javascript
+jQuery.ajaxPrefilter(function(options) {
+    if (options.crossDomain && jQuery.support.cors) {
+        options.url = 'https://cors-anywhere.herokuapp.com/' + options.url;
+    }
+});
+```
+
+#### Server
+
+The module exports `createServer(options)`, which creates a server that handles
+proxy requests. The following options are supported:
+
+* function `getProxyForUrl` - If set, specifies which intermediate proxy to use for a given URL.
+  If the return value is void, a direct request is sent. The default implementation is
+  [`proxy-from-env`](https://github.com/Rob--W/proxy-from-env), which respects the standard proxy
+  environment variables (e.g. `https_proxy`, `no_proxy`, etc.).  
+* array of strings `originBlacklist` - If set, requests whose origin is listed are blocked.  
+  Example: `['https://bad.example.com', 'http://bad.example.com']`
+* array of strings `originWhitelist` - If set, requests whose origin is not listed are blocked.  
+  If this list is empty, all origins are allowed.
+  Example: `['https://good.example.com', 'http://good.example.com']`
+* function `handleInitialRequest` - If set, it is called with the request, response and a parsed
+  URL of the requested destination (null if unavailable). If the function returns true, the request
+  will not be handled further. Then the function is responsible for handling the request.
+  This feature can be used to passively monitor requests, for example for logging (return false).
+* function `checkRateLimit` - If set, it is called with the origin (string) of the request. If this
+  function returns a non-empty string, the request is rejected and the string is send to the client.
+* boolean `redirectSameOrigin` - If true, requests to URLs from the same origin will not be proxied but redirected.
+  The primary purpose for this option is to save server resources by delegating the request to the client
+  (since same-origin requests should always succeed, even without proxying).
+* array of strings `requireHeader` - If set, the request must include this header or the API will refuse to proxy.  
+  Recommended if you want to prevent users from using the proxy for normal browsing.  
+  Example: `['Origin', 'X-Requested-With']`.
+* array of lowercase strings `removeHeaders` - Exclude certain headers from being included in the request.  
+  Example: `["cookie"]`
+* dictionary of lowercase strings `setHeaders` - Set headers for the request (overwrites existing ones).  
+  Example: `{"x-powered-by": "CORS Anywhere"}`
+* number `corsMaxAge` - If set, an Access-Control-Max-Age request header with this value (in seconds) will be added.  
+  Example: `600` - Allow CORS preflight request to be cached by the browser for 10 minutes.
+* string `helpFile` - Set the help file (shown at the homepage).  
+  Example: `"myCustomHelpText.txt"`
+
+For advanced users, the following options are also provided.
+
+* `httpProxyOptions` - Under the hood, [http-proxy](https://github.com/nodejitsu/node-http-proxy)
+  is used to proxy requests. Use this option if you really need to pass options
+  to http-proxy. The documentation for these options can be found [here](https://github.com/nodejitsu/node-http-proxy#options).
+* `httpsOptions` - If set, a `https.Server` will be created. The given options are passed to the
+  [`https.createServer`](https://nodejs.org/api/https.html#https_https_createserver_options_requestlistener) method.
+
+For even more advanced usage (building upon CORS Anywhere),
+see the sample code in [test/test-examples.js](test/test-examples.js).
+
+#### Demo server
+
+A public demo of CORS Anywhere is available at https://cors-anywhere.herokuapp.com. This server is
+only provided so that you can easily and quickly try out CORS Anywhere. To ensure that the service
+stays available to everyone, the number of requests per period is limited, except for requests from
+some explicitly whitelisted origins.
+
+**Note: as of February 2021, access to the demo server requires an opt-in**,
+see: https://github.com/Rob--W/cors-anywhere/issues/301
+
+If you expect lots of traffic, please host your own instance of CORS Anywhere, and make sure that
+the CORS Anywhere server only whitelists your site to prevent others from using your instance of
+CORS Anywhere as an open proxy.
+
+For instance, to run a CORS Anywhere server that accepts any request from some example.com sites on
+port 8080, use:
+```
+export PORT=8080
+export CORSANYWHERE_WHITELIST=https://example.com,http://example.com,http://example.com:8080
+node server.js
+```
+
+This application can immediately be run on Heroku, see https://devcenter.heroku.com/articles/nodejs
+for instructions. Note that their [Acceptable Use Policy](https://www.heroku.com/policy/aup) forbids
+the use of Heroku for operating an open proxy, so make sure that you either enforce a whitelist as
+shown above, or severly rate-limit the number of requests.
+
+For example, to blacklist abuse.example.com and rate-limit everything to 50 requests per 3 minutes,
+except for my.example.com and my2.example.com (which may be unlimited), use:
+
+```
+export PORT=8080
+export CORSANYWHERE_BLACKLIST=https://abuse.example.com,http://abuse.example.com
+export CORSANYWHERE_RATELIMIT='50 3 my.example.com my2.example.com'
+node server.js
+```
+
+
+### License
+
+Copyright (C) 2013 - 2021 Rob Wu <rob@robwu.nl>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.