The fetch() function is a Promise-based mechanism for programmatically making

web requests in the browser. This project is a polyfill that implements a subset

of the standard [Fetch specification][], enough to make fetch a viable

replacement for most uses of XMLHttpRequest in traditional web applications.

  Importing

  HTML

  JSON

  Response metadata

  Post form

  Post JSON

  File upload

  Caveats

    Handling HTTP error statuses

    Sending cookies

    Receiving cookies

    Redirect modes

    Obtaining the Response URL

    Aborting requests

If you believe you found a bug with how fetch behaves in your browser,

  please don't open an issue in this repository unless you are testing in

  an old version of a browser that doesn't support window.fetch natively.

  Make sure you read this _entire_ readme, especially the Caveats

  section, as there's probably a known work-around for an issue you've found.

  This project is a _polyfill_, and since all modern browsers now implement the

  fetch function natively, no code from this project actually takes any

  effect there. See Browser support for detailed

  information.

If you have trouble making a request to another domain (a different

  subdomain or port number also constitutes another domain), please familiarize

  yourself with all the intricacies and limitations of [CORS][] requests.

  Because CORS requires participation of the server by implementing specific

  HTTP response headers, it is often nontrivial to set up or debug. CORS is

  exclusively handled by the browser's internal mechanisms which this polyfill

  cannot influence.

This project doesn't work under Node.js environments. It's meant for web

  browsers only. You should ensure that your application doesn't try to package

  and run this on the server.

If you have an idea for a new feature of fetch, submit your feature

  requests to the specification's repository.

  We only add features and APIs that are part of the [Fetch specification][].

As an alternative to using npm, you can obtain fetch.umd.js from the

[Releases][] section. The UMD distribution is compatible with AMD and CommonJS