From 550b4f03065935c161011f67af6470ae74e9fd39 Mon Sep 17 00:00:00 2001
From: Christoffer <christoffer@again.app>
Date: Tue, 3 Jun 2025 15:52:54 +0200
Subject: [PATCH] Calculate correct content length for UTF-8 string
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

By using `Content-Length: request.length`, you risk telling the server the wrong byte‐count. Consider this payload:

```
    const response = await client.registerAccount({
      Firstname: "Christöffer",
      Lastname: "Skeppstedt",
      ...
    });
```

When the string contains an "ö" instead of "o", we have:
- Byte count: 930
- String length: 929

When this request is sent to the Trustly API, it responds back with:

```
{
  "name": "JSONRPCError",
  "code": 101,
  "message": "ERROR_MALFORMED_JSON"
}
```

This is likely because the content length header is incorrect. When instead using `Content-Length: Buffer.byteLength(request, 'utf8')`, the request is accepted.
---
 src/request/NodeJsHttpRequester.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/request/NodeJsHttpRequester.ts b/src/request/NodeJsHttpRequester.ts
index 44074fd..5862e8b 100644
--- a/src/request/NodeJsHttpRequester.ts
+++ b/src/request/NodeJsHttpRequester.ts
@@ -16,7 +16,7 @@ export class NodeJsHttpRequester implements HttpRequester {
           method: 'POST',
           headers: {
             'Content-Type': 'application/json',
-            'Content-Length': request.length,
+            'Content-Length': Buffer.byteLength(request, 'utf8'),
           },
         },
         response => {