Request: duplex property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The duplex read-only property of the Request interface returns the duplex mode of the request, which determines whether the browser must send the entire request before processing the response.
Value
A string with the following possible value:
"half"-
The browser must send the entire request before processing the response.
Notes
Although duplex can be passed as an option when constructing a Request, it is not currently exposed as a readable property on the resulting Request object in all browsers.
Examples
>Checking a request's duplex mode
js
const stream = new ReadableStream({
/* ... */
});
const request = new Request("/upload", {
method: "POST",
body: stream,
duplex: "half", // Required for streaming requests
});
console.log(request.duplex); // "half"
Specifications
| Specification |
|---|
| Fetch> # dom-request-duplex> |
Browser compatibility
Loading…
See also
- Fetch API
Request()constructorRequestInit.duplexin request options- Consuming a fetch as a stream