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12 changes: 8 additions & 4 deletions packages/react-dev-utils/WebpackDevServerUtils.js
Original file line number Diff line number Diff line change
Expand Up @@ -317,15 +317,19 @@ function prepareProxy(proxy, appPublicFolder) {
// For single page apps, we generally want to fallback to /index.html.
// However we also want to respect `proxy` for API calls.
// So if `proxy` is specified as a string, we need to decide which fallback to use.
// We use a heuristic: if request `accept`s text/html, we pick /index.html.
// We use a heuristic: We want to proxy all the requests that are not meant
// for static assets and as all the requests for static assets will be using
// `GET` method, we can proxy all non-`GET` requests.
// For `GET` requests, if request `accept`s text/html, we pick /index.html.
// Modern browsers include text/html into `accept` header when navigating.
// However API calls like `fetch()` won’t generally accept text/html.
// If this heuristic doesn’t work well for you, use a custom `proxy` object.
context: function(pathname, req) {
return (
mayProxy(pathname) &&
req.headers.accept &&
req.headers.accept.indexOf('text/html') === -1
req.method !== 'GET' ||
(mayProxy(pathname) &&
req.headers.accept &&
req.headers.accept.indexOf('text/html') === -1)
);
},
onProxyReq: proxyReq => {
Expand Down