headers overview

Headers combinator: sets headers on a Req and returns a Req.

Warning: the merging logic had to be “reversed” because of the contravariant nature of Reader and because the execution of combinators is from right to left (function composition).

This leads to a “weird” behavior for which the headers provided when Req is run win over the ones set with the combinator.

So, for example, if we have:

const request = pipe(appy.get, withHeaders({ 'X-Foo': 'bar' }), withHeaders({ 'X-Foo': 'baz' }))

request(['http://some.endpoint', { headers: { 'X-Foo': 'foo' } }])

when request is ran the underlying fetch call will be made with a X-Foo = 'foo' header.

Added in v3.0.0

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Table of contents

• combinators
  • withHeaders

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combinators

withHeaders

Merges provided Headers with Req ones and returns the updated Req.

Signature

export declare const withHeaders: (headers: HeadersInit) => Combinator

Added in v3.0.0