Function createDefaultHeadersMiddleware

Create a default headers middleware

Creates middleware that automatically merges default headers with request headers. Request headers take precedence over default headers.

Example: Basic usage

import { createFej, createDefaultHeadersMiddleware } from 'fej';

const api = createFej();
api.use('headers', createDefaultHeadersMiddleware({
  headers: {
    'Content-Type': 'application/json',
    'Accept': 'application/json',
  },
}), 90); // High priority, but after baseURL
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Example: With Headers object

const defaultHeaders = new Headers({
  'User-Agent': 'MyApp/1.0',
  'X-Custom-Header': 'value',
});

api.use('headers', createDefaultHeadersMiddleware({
  headers: defaultHeaders,
}));
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