61 lines
1.5 KiB
Markdown
61 lines
1.5 KiB
Markdown
# Interface: DispatchInterceptor
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Extends: `Function`
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A function that can be applied to the `Dispatcher.Dispatch` function before it is invoked with a dispatch request.
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This allows one to write logic to intercept both the outgoing request, and the incoming response.
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### Parameter: `Dispatcher.Dispatch`
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The base dispatch function you are decorating.
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### ReturnType: `Dispatcher.Dispatch`
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A dispatch function that has been altered to provide additional logic
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### Basic Example
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Here is an example of an interceptor being used to provide a JWT bearer token
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```js
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'use strict'
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const insertHeaderInterceptor = dispatch => {
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return function InterceptedDispatch(opts, handler){
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opts.headers.push('Authorization', 'Bearer [Some token]')
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return dispatch(opts, handler)
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}
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}
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const client = new Client('https://localhost:3000', {
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interceptors: { Client: [insertHeaderInterceptor] }
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})
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```
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### Basic Example 2
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Here is a contrived example of an interceptor stripping the headers from a response.
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```js
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'use strict'
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const clearHeadersInterceptor = dispatch => {
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const { DecoratorHandler } = require('undici')
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class ResultInterceptor extends DecoratorHandler {
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onHeaders (statusCode, headers, resume) {
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return super.onHeaders(statusCode, [], resume)
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}
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}
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return function InterceptedDispatch(opts, handler){
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return dispatch(opts, new ResultInterceptor(handler))
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}
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}
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const client = new Client('https://localhost:3000', {
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interceptors: { Client: [clearHeadersInterceptor] }
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})
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```
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