From e8ce2e4982f0d5f3dd4d40d2ff1383d8e31ccf23 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Piotr=20My=C5=9Bli=C5=84ski?= <git@pmysl.pl>
Date: Thu, 19 Mar 2026 10:38:38 +0100
Subject: [PATCH] pl-api: fix request body serialization for formData and
 bodiless requests

---
 packages/pl-api/lib/request.ts | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/packages/pl-api/lib/request.ts b/packages/pl-api/lib/request.ts
index 25d0e1a6b..f64e9679a 100644
--- a/packages/pl-api/lib/request.ts
+++ b/packages/pl-api/lib/request.ts
@@ -113,11 +113,13 @@ function request<T = any>(
   else if (this.accessToken) headers.set('Authorization', `Bearer ${this.accessToken}`);
   else if (this.customAuthorizationToken)
     headers.set('Authorization', this.customAuthorizationToken);
-  if (!formData) headers.set('Content-Type', contentType);
+  body =
+    body && (formData || contentType === '')
+      ? serialize(body, { indices: true })
+      : JSON.stringify(body);
+  if (!formData && body) headers.set('Content-Type', contentType);
   if (idempotencyKey) headers.set('Idempotency-Key', idempotencyKey);
 
-  body = body && contentType === '' ? serialize(body, { indices: true }) : JSON.stringify(body);
-
   // Fetch API doesn't report upload progress, use XHR
   if (onUploadProgress) {
     return new Promise<Response<T>>((resolve, reject) => {