diff --git a/src/index.ts b/src/index.ts
index bceaec67..99944bc4 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -16,9 +16,7 @@ export class GraphQLClient {
 
   constructor(url: string, options?: Options) {
     this.url = url
-    this.options = {
-      headers: (options && options.headers) ? options.headers : {},
-    }
+    this.options = options || {};
   }
 
   async request<T extends any>(query: string, variables?: Variables): Promise<T> {
@@ -29,6 +27,7 @@ export class GraphQLClient {
 
     const response = await fetch(this.url, {
       method: 'POST',
+      ...this.options,
       headers: Object.assign({'Content-Type': 'application/json'}, this.options.headers),
       body,
     })
diff --git a/src/types.ts b/src/types.ts
index 318cdc80..4b2e1c3e 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,7 +1,15 @@
 export type Variables = { [key: string]: any }
 
 export interface Options {
+  method?: RequestInit['method']
   headers?: { [key: string]: string }
+  mode?: RequestInit['mode']
+  credentials?: RequestInit['credentials']
+  cache?: RequestInit['cache']
+  redirect?: RequestInit['redirect']
+  referrer?: RequestInit['referrer']
+  referrerPolicy?: RequestInit['referrerPolicy']
+  integrity?: RequestInit['integrity']
 }
 
 export interface GraphQLError {
@@ -46,4 +54,3 @@ export class ClientError extends Error {
     }
   }
 }
-
diff --git a/tests/index.test.ts b/tests/index.test.ts
index af903132..be75f402 100644
--- a/tests/index.test.ts
+++ b/tests/index.test.ts
@@ -1,6 +1,7 @@
 import test from 'ava'
 import * as fetchMock from 'fetch-mock'
-import { ClientError, request } from '../src/index'
+import { ClientError, request, GraphQLClient } from '../src/index'
+import { Options } from '../src/types'
 
 test('minimal query', async (t) => {
   const data = {
@@ -46,6 +47,26 @@ test('content-type with charset', async (t) => {
   })
 })
 
+
+test('extra fetch options', async (t) => {
+  const options:Options = {
+    credentials: 'include',
+    mode: 'cors',
+    cache: 'reload',
+  }
+
+  const client = new GraphQLClient('https://mock-api.com/graphql', options)
+  await mock({
+    body: { data: {test: 'test'} }
+  }, async () => {
+    await client.request('{ test }')
+    const actualOptions = fetchMock.lastCall()[1]
+    for (let name in options) {
+      t.deepEqual(actualOptions[name], options[name]);
+    }
+  })
+})
+
 async function mock(response: any, testFn: () => Promise<void>) {
   fetchMock.mock({
     matcher: '*',