sgl-project/sglang

[Feature] Increase server payload size limit

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#6,622 opened on May 26, 2025

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good first issue

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Description

Checklist

Motivation

[Feature Request] Increase payload size limit for base64 images

Problem

Sending 10MB JSON with base64-encoded images to SGLang server fails with "payload reached size limit".

curl -X POST http://server:58000/v1/chat/completions -H "Content-Type: application/json" -d @base64.json
# Error: payload reached size limit

Request

Add configuration option to increase payload size limit, such as:

  • --max-payload-size flag
  • Environment variable support

Why needed

  • Avoid setting up NFS/file servers for multi-machine image sharing
  • Enable self-contained requests with multiple images
  • Simplify deployment in distributed environments

Current workaround

Store images in shared folder + use URLs (requires additional infrastructure setup)

Related resources

No response

Contributor guide

Research direction
Identify where the payload size limit is enforced in the server initialization (e.g., HTTP server or middleware) and add a command line flag max payload size to override the default.
Tech stack
python
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitPython
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
80