fix(fetch): Normalize header to be lowercase

src/http/http-native-impl.ts

@@ -1,5 +1,3 @@
-import { headerCase } from 'change-case';
-
 import type { MastoConfig } from '../config';
 import type { CreateErrorParams } from '../errors';
 import { createError, MastoError } from '../errors';
@@ -92,7 +90,7 @@ export class HttpNativeImpl extends BaseHttp implements Http {
     const result: Record<string, unknown> = {};
     // eslint-disable-next-line unicorn/no-array-for-each
     headers.forEach((value, key) => {
-      result[headerCase(key)] = value;
+      result[key.toLowerCase()] = value;
     });
     return result as Headers;
   }

src/paginator.spec.ts

@@ -2,24 +2,29 @@ import { BaseHttp } from './http/base-http';
 import { Paginator } from './paginator';
 import { SerializerNodejsImpl } from './serializers';
 
+const request = jest.fn();
 class Test extends BaseHttp {
   config = {
     url: 'https://mastodon.social',
     accessToken: 'token',
   };
-  request = jest.fn();
+  request = request;
   serializer = new SerializerNodejsImpl();
 }
 
 describe('Paginator', () => {
+  afterEach(() => {
+    request.mockClear();
+  });
+
   it('sends a request', async () => {
     const http = new Test();
     http.request.mockReturnValue({ headers: {} });
     const paginator = new Paginator(http, '/v1/api/timelines', {
       foo: 'bar',
     });
     await paginator.next();
-    expect(http.request.mock.calls[0][0]).toEqual({
+    expect(http.request).toBeCalledWith({
       method: 'get',
       url: '/v1/api/timelines',
       params: { foo: 'bar' },
@@ -30,13 +35,13 @@ describe('Paginator', () => {
     const http = new Test();
     http.request.mockReturnValue({
       headers: {
-        Link: '<https://mastodon.social/api/v1/timelines/home?max_id=109382006402042919>; rel="next", <https://mastodon.social/api/v1/timelines/home?min_id=109382039876197520>; rel="prev"',
+        link: '<https://mastodon.social/api/v1/timelines/home?max_id=109382006402042919>; rel="next", <https://mastodon.social/api/v1/timelines/home?min_id=109382039876197520>; rel="prev"',
       },
     });
     const paginator = new Paginator(http, '/v1/api/timelines');
     await paginator.next();
     await paginator.next();
-    expect(http.request.mock.calls[1][0]).toEqual({
+    expect(http.request).toBeCalledWith({
       method: 'get',
       params: undefined,
       url: '/api/v1/timelines/home?max_id=109382006402042919',

src/paginator.ts

@@ -34,8 +34,8 @@ export class Paginator<Params, Result>
     });
 
     this.nextUrl =
-      typeof response.headers?.Link === 'string'
-        ? this.pluckNext(response.headers.Link)
+      typeof response.headers?.link === 'string'
+        ? this.pluckNext(response.headers.link)
         : undefined;
 
     return {