Set content-length header when using form-data

sindresorhus · sindresorhus · commit de9514d897ca · 2018-05-01T14:25:42.000+07:00
Fixes #466
diff --git a/index.js b/index.js
@@ -254,6 +254,15 @@ function requestAsEventEmitter(opts) {
 		Promise.resolve(getBodySize(opts))
 			.then(size => {
 				uploadBodySize = size;
+
+				if (
+					is.undefined(opts.headers['content-length']) &&
+					is.undefined(opts.headers['transfer-encoding']) &&
+					isFormData(opts.body)
+				) {
+					opts.headers['content-length'] = size;
+				}
+
 				get(opts);
 			})
 			.catch(err => {
diff --git a/test/headers.js b/test/headers.js
@@ -105,6 +105,14 @@ test('form-data automatic content-type', async t => {
 	t.is(headers['content-type'], `multipart/form-data; boundary=${form.getBoundary()}`);
 });
 
+test('form-data sets content-length', async t => {
+	const form = new FormData();
+	form.append('a', 'b');
+	const {body} = await got(s.url, {body: form});
+	const headers = JSON.parse(body);
+	t.is(headers['content-length'], '157');
+});
+
 test('remove null value headers', async t => {
 	const headers = (await got(s.url, {
 		headers: {
