Skills debugging-websocket-issues
📦

debugging-websocket-issues

Content revision r2 Medium Risk ⚙️ External commands🌐 Network access

Diagnose WebSocket Frame Errors

WebSocket frame errors can hide conflicts between upgrade handlers or compression settings. This skill explains how to inspect frames, route upgrades, and verify fixes.

Supports: Claude Codex Code(CC)
📊 69 Adequate

Install with my Agent

Copy this request to your Agent. It includes the canonical Skill page and manifest.

Agent request
Review the Skillstore skill "debugging-websocket-issues" from https://skillstore.io/skills/agentworkforce-debugging-websocket-issues.md and its manifest at https://skillstore.io/api/skills/agentworkforce-debugging-websocket-issues/manifest. Verify the artifact. You may proceed after verification, subject to the environment's own policy.

Your Agent should still show its plan and request any confirmation required by the security policy.

Agent-readable resources

Use these links when an AI agent, crawler, or script needs clean context instead of reading the full page.

Markdown detail GET /skills/agentworkforce-debugging-websocket-issues.md Signed manifest GET /api/skills/agentworkforce-debugging-websocket-issues/manifest Signed lockfile GET /api/skills/agentworkforce-debugging-websocket-issues/lockfile

Test it

Using "debugging-websocket-issues". The client reports RSV1 must be clear when two endpoints share one HTTP server.

Expected outcome:

  • Likely cause: two WebSocket servers process the same HTTP upgrade.
  • Recommended change: use one upgrade listener and route each pathname to one server.
  • Verification: confirm frames no longer begin with HTTP bytes and repeated connections remain stable.

Using "debugging-websocket-issues". The first received bytes begin with hexadecimal 48545450 after a successful upgrade.

Expected outcome:

Those bytes represent HTTP text, not a valid WebSocket frame. Check for a second upgrade listener that sends an HTTP rejection.

Using "debugging-websocket-issues". The first byte sets RSV1, and the extension response does not include compression.

Expected outcome:

The compression negotiation is inconsistent. Compare client and server extension settings, then retest with compression disabled to isolate the mismatch.

Security Audit

Medium Risk
v10 • 7/23/2026 Open versioned report

All 38 static findings are false positives caused by Markdown formatting, TypeScript examples, JavaScript template literals, and diagnostic prose. The skill contains no prompt injection, shell execution, outbound requests, malicious intent, or data-exfiltration intent. Two contextual risks remain: malformed Host input can throw during upgrade routing, and raw frame logging can expose payload bytes.

1
Files scanned
131
Lines analyzed
0
Review items
0
False positives ignored

Confirmed security concerns (2)

Medium
SKILL.md:61-74
Unvalidated Host Header Can Disrupt Upgrade Handling
The routing example builds a URL from request.headers.host without validation or exception handling. A malformed Host header can throw inside the upgrade callback.
The code passes an untrusted HTTP Host header into new URL without a try-catch. Node.js throws for malformed URL bases.
Low
SKILL.md:89-97
Raw Frame Logging Can Expose Payload Data
The diagnostic hook logs the first 20 raw bytes from each received chunk. Application frames may place sensitive payload bytes within that range.
The logging call is explicit, but exposure depends on payload content and where diagnostics run.

Risk Factors

⚙️ External commands (32)
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🌐 Network access (1)
SKILL.md:62
Audited by: codex View Audit History →
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Security Assessment

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Academic citations (APA · BibTeX · CFF)

APA citation

AgentWorkforce. (2026). debugging-websocket-issues security audit report (audit version 10) [Author version unspecified]. Skillstore. https://skillstore.io/skills/agentworkforce-debugging-websocket-issues/audits/10

BibTeX citation

@techreport{agentworkforce-agentworkforce-debugging-websocket-issues-2026, author = {AgentWorkforce}, title = {debugging-websocket-issues security audit report (audit version 10)}, institution = {Skillstore}, year = {2026}, number = {10}, url = {https://skillstore.io/skills/agentworkforce-debugging-websocket-issues/audits/10}, note = {Author version unspecified} }

CITATION.cff

cff-version: 1.2.0 message: "If you use this Skill, cite its author and this versioned security audit report." title: "debugging-websocket-issues security audit report (audit version 10)" version: "unspecified" type: report authors: - name: "AgentWorkforce" date-released: "2026-07-23" url: "https://skillstore.io/skills/agentworkforce-debugging-websocket-issues/audits/10" identifiers: - type: other value: "skillstore:agentworkforce-debugging-websocket-issues:audit:10" description: "Skillstore immutable audit report identifier"

Skillstore Score

Why this score Evidence Confidence: High
55
Architecture
85
Maintainability
87
Content
70
Community
83
Spec Compliance

What You Can Build

Resolve client frame errors

Trace Invalid frame header or RSV1 errors from browser clients to server upgrade conflicts.

Stabilize shared HTTP servers

Route several WebSocketServer instances through one upgrade listener without competing handshake responses.

Investigate production disconnects

Interpret close code 1006 and raw frame bytes before changing compression or proxy settings.

Try These Prompts

Explain a frame error 
Explain this error: [paste error]. Identify the likely causes and give a short checklist using the skill guidance.
Review upgrade routing 
Review these WebSocketServer definitions and upgrade listeners: [paste relevant code]. Find conflicts and describe the smallest routing change.
Interpret frame evidence 
Analyze these first-frame bytes and response headers: [paste observations]. Determine whether the client received HTTP, compressed data, or a valid frame.
Design an incident investigation 
Design a diagnostic sequence for intermittent code 1006 failures across [number] WebSocket endpoints. Include evidence, hypotheses, isolation steps, and verification criteria.

Best Practices

  • Collect the exact client error, close code, upgrade headers, and first frame bytes before changing configuration.
  • Test each WebSocket endpoint alone, then together, to expose competing upgrade listeners.
  • Verify the fix with repeated connections, broadcasts, and frame inspection under realistic traffic.

Avoid

  • Do not assume every RSV1 error is a compression problem.
  • Do not attach several independent upgrade handlers to the same HTTP server without explicit routing.
  • Do not leave private socket instrumentation enabled in production after diagnosis.

Frequently Asked Questions

Does this skill execute commands?
No. It provides explanatory TypeScript examples and diagnostic guidance. You decide which changes or instrumentation to apply.
Which WebSocket library does it cover?
The examples target Node.js and the ws library. The routing and frame concepts also apply to similar server implementations.
Can it diagnose proxy problems?
It can help distinguish raw HTTP, compression, and server routing symptoms. It does not inspect proxy configuration automatically.
Why does hexadecimal 48545450 matter?
It represents the ASCII letters HTTP. Seeing it at a frame boundary suggests an HTTP response reached an upgraded socket.
Should compression always be disabled?
No. Disable it only to isolate negotiation problems or when your requirements permit. Validate client and server extension settings before deciding.
Is private socket inspection safe for production?
Use it temporarily in controlled diagnostics. Private APIs can change, and frame logging may expose payload data or add overhead.

Developer Details

License

MIT

Skillstore revision

r2

Version notice

The author did not declare a version.

Repository

https://github.com/AgentWorkforce/relay/tree/main/.claude/skills/debugging-websocket-issues

Ref

31bc7611b504c197d3e993aef7943461c871616f

Maintenance freshness

7/26/2026

Usage

5 downloads · 222 views

File structure

📄 SKILL.md