diff --git a/README.md b/README.md
index f852aa4..8bd077f 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,7 @@ Options:
   -o, --output <./myClient>                    output directory
   -e, --endpoint <http://example.com/graphql>  GraphQL endpoint
   -p, --post                                   use POST for introspection query
+  -H, --header <'header: value'>                 headers to use in fetch
   -s, --schema <./*.graphql>                   glob pattern to match GraphQL schema definition files
   -f, --fetcher <./schemaFetcher.js>           path to introspection query fetcher file
   -c, --config <./myConfig.js>                 path to config file
diff --git a/src/cli.ts b/src/cli.ts
index 45086f4..6920fb0 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -9,10 +9,15 @@ import { validateConfigs } from './cliHelpers/validateConfigs'
 import { Config } from './config'
 import { requireModuleFromPath } from './helpers/files'
 
+function collect(value: string, previous: string[]) {
+  return previous.concat([value])
+}
+
 program
   .option('-o, --output <./myClient>', 'output directory')
   .option('-e, --endpoint <http://example.com/graphql>', 'GraphQL endpoint')
   .option('-p, --post', 'use POST for introspection query')
+  .option("-H, --header <'header: value'>", 'headers to use in fetch', collect, [])
   .option('-s, --schema <./mySchema.graphql>', 'path to GraphQL schema definition file')
   .option('-f, --fetcher <./schemaFetcher.js>', 'path to introspection query fetcher file')
   .option('-c, --config <./myConfig.js>', 'path to config file')
@@ -27,6 +32,7 @@ const configs: Config[] = program.config
       {
         endpoint: program.endpoint,
         post: program.post,
+        headers: program.header,
         schema: program.schema,
         output: program.output,
         fetcher: program.fetcher,
@@ -35,7 +41,12 @@ const configs: Config[] = program.config
 
 if (!validateConfigs(configs)) program.help()
 
-new Listr(configs.map(config => task(config)), { renderer: program.verbose ? 'verbose' : 'default' }).run().catch(e => {
-  console.log(chalk.red(e.stack))
-  process.exit(1)
-})
+new Listr(
+  configs.map(config => task(config)),
+  { renderer: program.verbose ? 'verbose' : 'default' },
+)
+  .run()
+  .catch(e => {
+    console.log(chalk.red(e.stack))
+    process.exit(1)
+  })
diff --git a/src/cliHelpers/schemaTask.ts b/src/cliHelpers/schemaTask.ts
index 3afab8e..7cd7daa 100644
--- a/src/cliHelpers/schemaTask.ts
+++ b/src/cliHelpers/schemaTask.ts
@@ -12,7 +12,7 @@ export const schemaTask = (config: Config): ListrTask => {
     return {
       title: `fetching schema using ${config.post ? 'POST' : 'GET'} ${endpoint}`,
       task: async ctx => {
-        ctx.schema = await fetchSchema(endpoint, config.post)
+        ctx.schema = await fetchSchema(endpoint, config.post, undefined, config.headers)
       },
     }
   } else if (config.fetcher) {
diff --git a/src/cliHelpers/validateConfigs.ts b/src/cliHelpers/validateConfigs.ts
index e0317a4..ca1043d 100644
--- a/src/cliHelpers/validateConfigs.ts
+++ b/src/cliHelpers/validateConfigs.ts
@@ -18,6 +18,12 @@ export const validateConfigs = (configs: Config[]) => {
       )
 
     if (!config.output) errors.push(`you didn't provide an \`output\` option in ${whichConfig}`)
+
+    if (config.headers) {
+      config.headers.forEach(header => {
+        if (!header.includes(':')) errors.push(`header options is invalid in ${whichConfig}`)
+      })
+    }
   })
 
   errors.forEach(error => console.log(chalk.red(`Error: ${error}`)))
diff --git a/src/config.ts b/src/config.ts
index 18ef84f..d302a40 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -13,6 +13,7 @@ export interface Options {
 export interface Config {
   endpoint?: string
   post?: boolean
+  headers?: string[]
   schema?: string
   output?: string
   fetcher?: string | SchemaFetcher
diff --git a/src/schema/fetchSchema.ts b/src/schema/fetchSchema.ts
index 0ad1965..0715841 100644
--- a/src/schema/fetchSchema.ts
+++ b/src/schema/fetchSchema.ts
@@ -7,20 +7,41 @@ export interface SchemaFetcher {
   (query: string, fetchImpl: typeof fetch, qsImpl: typeof qs): Promise<ExecutionResult<IntrospectionQuery>>
 }
 
-export const get = <T>(uri: string, query: { [arg: string]: any }): Promise<T> =>
-  fetch(`${uri}?${qs.stringify(query)}`).then(r => r.json())
+export const get = <T>(uri: string, query: { [arg: string]: any }, headers: HeadersInit = {}): Promise<T> =>
+  fetch(`${uri}?${qs.stringify(query)}`, {
+    headers: { ...headers },
+  }).then(r => r.json())
 
-export const post = <T>(uri: string, body: { [arg: string]: any }): Promise<T> =>
+export const post = <T>(uri: string, body: { [arg: string]: any }, headers: HeadersInit = {}): Promise<T> =>
   fetch(uri, {
     method: 'POST',
     body: JSON.stringify(body),
-    headers: { 'Content-Type': 'application/json' },
+    headers: { 'Content-Type': 'application/json', ...headers },
   }).then(r => r.json())
 
-export const fetchSchema = async (endpoint: string, usePost = false, options?: GraphQLSchemaValidationOptions) => {
+export const fetchSchema = async (
+  endpoint: string,
+  usePost = false,
+  options?: GraphQLSchemaValidationOptions,
+  headers?: string[],
+) => {
+  const jsonHeaders = headers
+    ? headers.reduce(
+        (retval, header) => {
+          const split = header.split(':')
+          if (split.length > 1) {
+            retval[split[0].trim()] = split[1].trim()
+          }
+          return retval
+        },
+        {} as {
+          [key: string]: string
+        },
+      )
+    : undefined
   const result = usePost
-    ? await post<ExecutionResult<IntrospectionQuery>>(endpoint, { query: getIntrospectionQuery() })
-    : await get<ExecutionResult<IntrospectionQuery>>(endpoint, { query: getIntrospectionQuery() })
+    ? await post<ExecutionResult<IntrospectionQuery>>(endpoint, { query: getIntrospectionQuery() }, jsonHeaders)
+    : await get<ExecutionResult<IntrospectionQuery>>(endpoint, { query: getIntrospectionQuery() }, jsonHeaders)
 
   if (!result.data) {
     throw new Error('introspection request did not receive a valid response')