Controller crashes when using incorrect Content-Length in JSON request

[someoverflow]

What happened?

I’m using a Siemens SPS to control the LEDs on an ESP32-POE-ISO. Since it’s a Siemens SPS, I wrote a small program for the WLED JSON API, but I encountered an issue where the ESP controller crashes whenever I send an incorrect Content-Length header. Initially, I thought the issue was something entirely different because my program was timing out. However, after noticing that the controller’s uptime resets every time a request is made, it became clear that the timeout was actually due to the crash. I then started experimenting with the headers and found that if I omit the Content-Length header entirely, nothing happens so as long as the Content-Length is correct, it responds with a success JSON. But if I specify an incorrect value, the controller crashes.

Tried it on ESP32-POE-ISO and ESP32 C3

To Reproduce Bug

Send a request like this to any controller, and the controller will crash, causing the web request to fail or timeout:

POST /json HTTP/1.1
Host: 192.168.1.235 (Controller IP)
User-Agent: Test Client
Content-Type: application/json
Content-Length: 10

{"on":true,"bri":128} 

Expected Behavior

I’m not sure if this is fixable or if it’s an issue with the standard system packages, but I would expect a 500 Internal Server Error or some other error, rather than the controller crashing. I know it’s not a typical issue, but without access to logs or something that indicates the issue, troubleshooting becomes really challenging.

Install Method

Binary from WLED.me

What version of WLED?

WLED 0.15.0 (2412100)

Which microcontroller/board are you seeing the problem on?

ESP32

Relevant log/trace output

Anything else?

No response

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