diff --git a/src/kiri/platform.js b/src/kiri/platform.js
index 4a8ee309..13575ec9 100644
--- a/src/kiri/platform.js
+++ b/src/kiri/platform.js
@@ -328,7 +328,7 @@ function platformLoad(url, onload) {
     }
 }
 
-function platformLoadSTL(url, onload, formdata, credentials) {
+function platformLoadSTL(url, onload, formdata, credentials, headers) {
     new load.STL().load(url, (vertices, filename) => {
         if (vertices) {
             let widget = newWidget().loadVertices(vertices);
@@ -338,7 +338,7 @@ function platformLoadSTL(url, onload, formdata, credentials) {
                 onload(vertices, widget);
             }
         }
-    }, formdata, 1 / api.view.unit_scale(), credentials);
+    }, formdata, 1 / api.view.unit_scale(), credentials, headers);
 }
 
 function platformLoadURL(url, options = {}) {
diff --git a/src/load/stl.js b/src/load/stl.js
index 8570c260..866fd86a 100644
--- a/src/load/stl.js
+++ b/src/load/stl.js
@@ -23,13 +23,14 @@ function STL() {
     this.colors = null;
 }
 
-SP.load = function(url, callback, formdata, scale, credentials) {
+SP.load = function(url, callback, formdata, scale, credentials, headers) {
     const stl = this;
 
     fetch(url, {
         method: formdata ? 'POST' : 'GET',
         credentials: credentials ? credentials : 'same-origin',
-        body: formdata
+        body: formdata,
+        ...(headers ? {headers: headers} : {})
     }).then(response => {
         if (response.status === 200 || response.status === 0) {
             response.arrayBuffer().then(buffer => {