request.json() behaves inconsistently — sometimes requires json.loads(request.body) fallback

[sansyrox]

Description

In a Robyn 0.81.0 application with multiple POST/PATCH/PUT endpoints, request.json() works correctly for most handlers but silently fails or misbehaves for certain PATCH and PUT endpoints. The workaround is to use json.loads(request.body) instead, which always works.

Reproduction

from robyn import Robyn, Request, Response, ALLOW_CORS
import json

app = Robyn(__file__)
ALLOW_CORS(app, origins=["*"])

# This works fine
@app.post("/v1/alerts")
async def create_alert(request: Request) -> Response:
    body = request.json()  # ✅ works
    return Response(status_code=200, description=json.dumps(body))

# This does NOT work reliably — request.json() returns unexpected results
@app.patch("/v1/orgs/billing")
async def update_billing(request: Request) -> Response:
    body = request.json()  # ❌ fails silently or returns wrong data
    # Workaround:
    body = json.loads(request.body)  # ✅ always works
    return Response(status_code=200, description=json.dumps(body))

# Same issue on PUT
@app.put("/v1/pricing")
async def update_pricing(request: Request) -> Response:
    body = request.json()  # ❌ same issue
    body = json.loads(request.body)  # ✅ workaround
    return Response(status_code=200, description=json.dumps(body))

Observed behavior

• request.json() works on POST endpoints but behaves inconsistently on PATCH/PUT endpoints in the same application.
• json.loads(request.body) works correctly in all cases.

Expected behavior

request.json() should behave identically regardless of HTTP method.

Environment

• Robyn version: 0.81.0
• Python: 3.13
• OS: macOS (darwin 25.2.0)