From 76432c18bee20e2cbd9e673af8a3bf43641ad115 Mon Sep 17 00:00:00 2001
From: Dmitriy Mozgovoy <robotshara@gmail.com>
Date: Wed, 27 Apr 2022 12:26:52 +0300
Subject: [PATCH] Fixed FormData posting in browser environment by reverting
 #3785; (#4640)

* Fixed posting FormData in browser environment by reverting #3785;

* Added ability to keep `Content-Type` header in non-standard browser environments;

* Added browser test of FormData posting using external HTTP service (https://httpbin.org/post);

Co-authored-by: Jay <jasonsaayman@gmail.com>
---
 lib/adapters/xhr.js         |  4 ++++
 test/specs/formdata.spec.js | 14 ++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 test/specs/formdata.spec.js

diff --git a/lib/adapters/xhr.js b/lib/adapters/xhr.js
index 5da074dde9..d1a7b804b5 100644
--- a/lib/adapters/xhr.js
+++ b/lib/adapters/xhr.js
@@ -27,6 +27,10 @@ module.exports = function xhrAdapter(config) {
       }
     }
 
+    if (utils.isFormData(requestData) && utils.isStandardBrowserEnv()) {
+      delete requestHeaders['Content-Type']; // Let the browser set it
+    }
+
     var request = new XMLHttpRequest();
 
     // HTTP basic authentication
diff --git a/test/specs/formdata.spec.js b/test/specs/formdata.spec.js
new file mode 100644
index 0000000000..5c8cca79d0
--- /dev/null
+++ b/test/specs/formdata.spec.js
@@ -0,0 +1,14 @@
+
+describe('FormData', function() {
+  it('should allow FormData posting', function () {
+    return axios.postForm('http://httpbin.org/post', {
+      a: 'foo',
+      b: 'bar'
+    }).then(({data}) => {
+      expect(data.form).toEqual({
+        a: 'foo',
+        b: 'bar'
+      });
+    });
+  });
+})