Function transport

Creates a middleware routing exchanges through a given fetch implementation.

Supplies the transport a client is to run on, for instance a proxy-bound undici fetch, a platform service binding, or a test double, in place of the standard function createFetch would otherwise delegate to:

const client = createFetch(basic("user", "secret"), success(), transport(custom));
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Ignores the Fetch implementation it wraps, delegating every exchange to fetch instead: middlewares declared before it process exchanges as usual, while middlewares declared after it are never reached, so this middleware is to be declared last in a chain.