CORS error code example

Example 1: cors error in flask

from flask import Flask
from flask_cors import CORS, cross_origin

app = Flask(__name__)
CORS(app)

@app.route("/")
def helloWorld():
    return "Hello world"

Example 2: nock CORS error

fetchNockProject = nock($API)
                   .defaultReplyHeaders({ 'access-control-allow-origin': '*' })
                   .get('/projects/1')
                   .reply('200', project);

Example 3: allow cross origin

Access-Control-Allow-Origin: *
Access-Control-Allow-Origin: <origin>
Access-Control-Allow-Origin: null

Example 4: javascript cors error

$.ajax({
            headers: { "Accept": "application/json"},
            type: 'GET',
            url: 'http://cl.ly/2wr4',
            crossDomain: true,
            beforeSend: function(xhr){
                xhr.withCredentials = true;
          },
            success: function(data, textStatus, request){
                console.log(data);
            }
 });

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Javascript Example

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