diff --git a/docs/api/en/loaders/FileLoader.html b/docs/api/en/loaders/FileLoader.html
index ab81a82539ece2..98d32654803d3d 100644
--- a/docs/api/en/loaders/FileLoader.html
+++ b/docs/api/en/loaders/FileLoader.html
@@ -69,9 +69,6 @@ <h3>[property:String mimeType]</h3>
 			See [page:.setMimeType]. Default is *undefined*.
 		</p>
 
-		<h3>[property:Object requestHeader]</h3>
-		<p>The [link:https://developer.mozilla.org/en-US/docs/Glossary/Request_header request header] used in HTTP request. See [page:.setRequestHeader]. Default is *undefined*.</p>
-
 		<h3>[property:String responseType]</h3>
 		<p>The expected response type. See [page:.setResponseType]. Default is *undefined*.</p>
 
@@ -102,13 +99,6 @@ <h3>[method:FileLoader setMimeType]( [param:String mimeType] )</h3>
 			of the file being loaded. Note that in many cases this will be determined automatically, so by default it is *undefined*.
 		</p>
 
-		<h3>[method:FileLoader setRequestHeader]( [param:Object requestHeader] )</h3>
-		<p>
-			[page:object requestHeader] - key: The name of the header whose value is to be set. value: The value to set as the body of the header.<br /><br />
-
-			Set the [link:https://developer.mozilla.org/en-US/docs/Glossary/Request_header request header] used in HTTP request.
-		</p>
-
 		<h3>[method:FileLoader setResponseType]( [param:String responseType] )</h3>
 		<p>
 			Change the response type. Valid values are:<br />
diff --git a/docs/api/en/loaders/Loader.html b/docs/api/en/loaders/Loader.html
index be58a16d6a731e..3963663976f2f5 100644
--- a/docs/api/en/loaders/Loader.html
+++ b/docs/api/en/loaders/Loader.html
@@ -50,6 +50,11 @@ <h3>[property:String resourcePath]</h3>
 			Default is the empty string.
 		</p>
 
+		<h3>[property:Object requestHeader]</h3>
+		<p>
+			The [link:https://developer.mozilla.org/en-US/docs/Glossary/Request_header request header] used in HTTP request. See [page:.setRequestHeader]. Default is empty object.
+		</p>
+
 		<h2>Methods</h2>
 
 		<h3>[method:void load]()</h3>
@@ -89,6 +94,13 @@ <h3>[method:Loader setResourcePath]( [param:String resourcePath] )</h3>
 			[page:String resourcePath] — Set the base path for dependent resources like textures.
 		</p>
 
+		<h3>[method:Loader setRequestHeader]( [param:Object requestHeader] )</h3>
+		<p>
+			[page:object requestHeader] - key: The name of the header whose value is to be set. value: The value to set as the body of the header.<br /><br />
+
+			Set the [link:https://developer.mozilla.org/en-US/docs/Glossary/Request_header request header] used in HTTP request.
+		</p>
+
 		<h2>Source</h2>
 
 		<p>
diff --git a/examples/js/loaders/GLTFLoader.js b/examples/js/loaders/GLTFLoader.js
index 1b3017ffe6b307..7c75e0afffc1e1 100644
--- a/examples/js/loaders/GLTFLoader.js
+++ b/examples/js/loaders/GLTFLoader.js
@@ -67,6 +67,7 @@ THREE.GLTFLoader = ( function () {
 
 			loader.setPath( this.path );
 			loader.setResponseType( 'arraybuffer' );
+			loader.setRequestHeader( this.requestHeader );
 
 			if ( scope.crossOrigin === 'use-credentials' ) {
 
@@ -218,6 +219,7 @@ THREE.GLTFLoader = ( function () {
 
 			} );
 
+			parser.fileLoader.setRequestHeader( this.requestHeader );
 			parser.parse( onLoad, onError );
 
 		}
diff --git a/examples/jsm/loaders/GLTFLoader.js b/examples/jsm/loaders/GLTFLoader.js
index 17c50255f2150d..de47e1eb3e6942 100644
--- a/examples/jsm/loaders/GLTFLoader.js
+++ b/examples/jsm/loaders/GLTFLoader.js
@@ -78,7 +78,6 @@ var GLTFLoader = ( function () {
 
 		this.dracoLoader = null;
 		this.ddsLoader = null;
-
 	}
 
 	GLTFLoader.prototype = Object.assign( Object.create( Loader.prototype ), {
@@ -131,6 +130,7 @@ var GLTFLoader = ( function () {
 
 			loader.setPath( this.path );
 			loader.setResponseType( 'arraybuffer' );
+			loader.setRequestHeader( this.requestHeader );
 
 			if ( scope.crossOrigin === 'use-credentials' ) {
 
@@ -282,6 +282,7 @@ var GLTFLoader = ( function () {
 
 			} );
 
+			parser.fileLoader.setRequestHeader( this.requestHeader );
 			parser.parse( onLoad, onError );
 
 		}
diff --git a/src/loaders/FileLoader.d.ts b/src/loaders/FileLoader.d.ts
index c7ec1a4963fd7f..933aec49dcaa81 100644
--- a/src/loaders/FileLoader.d.ts
+++ b/src/loaders/FileLoader.d.ts
@@ -8,7 +8,6 @@ export class FileLoader extends Loader {
 	mimeType: undefined | MimeType;
 	responseType: undefined |string;
 	withCredentials: undefined |string;
-	requestHeader: undefined | { [header: string]: string };
 
 	load(
 		url: string,
@@ -19,6 +18,5 @@ export class FileLoader extends Loader {
 	setMimeType( mimeType: MimeType ): FileLoader;
 	setResponseType( responseType: string ): FileLoader;
 	setWithCredentials( value: boolean ): FileLoader;
-	setRequestHeader( value: { [header: string]: string } ): FileLoader;
 
 }
diff --git a/src/loaders/FileLoader.js b/src/loaders/FileLoader.js
index 1cc47baa14285e..452bfd3c807411 100644
--- a/src/loaders/FileLoader.js
+++ b/src/loaders/FileLoader.js
@@ -301,13 +301,6 @@ FileLoader.prototype = Object.assign( Object.create( Loader.prototype ), {
 		this.mimeType = value;
 		return this;
 
-	},
-
-	setRequestHeader: function ( value ) {
-
-		this.requestHeader = value;
-		return this;
-
 	}
 
 } );
diff --git a/src/loaders/Loader.d.ts b/src/loaders/Loader.d.ts
index ef9bf7bd296104..fefe671e798f94 100644
--- a/src/loaders/Loader.d.ts
+++ b/src/loaders/Loader.d.ts
@@ -11,6 +11,7 @@ export class Loader {
 	path: string;
 	resourcePath: string;
 	manager: LoadingManager;
+	requestHeader: { [header: string]: string };
 
 	/*
 	load(): void;
@@ -22,5 +23,6 @@ export class Loader {
 	setCrossOrigin( crossOrigin: string ): this;
 	setPath( path: string ): this;
 	setResourcePath( resourcePath: string ): this;
+	setRequestHeader( requestHeader: { [header: string]: string } ): this;
 
 }
diff --git a/src/loaders/Loader.js b/src/loaders/Loader.js
index 0f3b8d0fe21fcc..a21ecd84a687b3 100644
--- a/src/loaders/Loader.js
+++ b/src/loaders/Loader.js
@@ -11,6 +11,7 @@ function Loader( manager ) {
 	this.crossOrigin = 'anonymous';
 	this.path = '';
 	this.resourcePath = '';
+	this.requestHeader = {};
 
 }
 
@@ -51,6 +52,13 @@ Object.assign( Loader.prototype, {
 		this.resourcePath = resourcePath;
 		return this;
 
+	},
+
+	setRequestHeader: function ( requestHeader ) {
+
+		this.requestHeader = requestHeader;
+		return this;
+
 	}
 
 } );