What is JSONP, and why was it created?

It’s actually not too complicated… Say you’re on domain example.com, and you want to make a request to domain example.net. To do so, you need to cross domain boundaries, a no-no in most of browserland. The one item that bypasses this limitation is <script> tags. When you use a script tag, the domain limitation is … Read more

Error OPTIONS net::ERR_CONNECTION_REFUSED

I am developing a web application using “jQuery”(front-end) and “Python”(back-end). While making a PUT request to update details in the database, this is the error I get in the console: OPTIONS “REST API URL” net::ERR_CONNECTION_REFUSED My jQuery code is: I read about how HTTP Requests other than GET and POST are first pre-flighted as OPTIONS … Read more

Cannot set property InnerHTML of null [duplicate]

You are almost certainly running your code before the DOM is constructed. Try running your code in a window.onload handler function (but see note below): Another popular cross-browser solution is to put your <script> block just before the closing </body> tag. This could be the best solution for you, depending on your needs: Note that … Read more

Babel 6 regeneratorRuntime is not defined

babel-polyfill (deprecated as of Babel 7.4) is required. You must also install it in order to get async/await working. package.json .babelrc .js with async/await (sample code) In the startup file If you are using webpack you need to put it as the first value of your entry array in your webpack configuration file (usually webpack.config.js), … Read more