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New FAQ Doc for OpenResty XRay

Yichun Zhang Posted Feb 7, 2023 Updated Jun 18, 2026

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We recently prepared a new FAQ document for our OpenResty XRay product on our website:

https://openresty.com/en/xray/faq/

It summaries true frequently-asked questions from our users over the years.

If you have even more questions, feel free to contact us by sending emails to info@openresty.com. Thank you!

Try out OpenResty XRay for free today

OpenResty XRay Aug 24, 2022

One String Value Crashed Asia's Biggest Streaming Site — We Found It with OpenResty XRay

The Platform Behind Hundreds of Millions of Streams
When Rebooting Doesn’t Help
Finding the Root Cause Without Touching a Single Line of Code
One Type Mismatch, Entire System Down

OpenResty XRay Mar 24, 2026

Binary Vulnerability Scanning: Catch Backported Patches, Cut False Positives

Why Version-Matching Vulnerability Scanning Fails: Three Compounding Costs
How OpenResty XRay’s Binary Vulnerability Scanning Works: The Evidence-First Model
Case Study: Binary Vulnerability Scanning on Rocky Linux with Dual OpenSSL Versions
From Alert Fatigue to Precision: A Sustainable Vulnerability Scanning Practice

OpenResty XRay Feb 10, 2026

Introduction to OpenResty XRay

Core Philosophy: A Tracing Engine Built for the Unknown
Turning Noise into Signal: How XRay Demystifies Production Issues
Empowering Engineering Teams in Cloud-Native Reality
Built on a Robust, Open Technological Foundatione
Real-World Success Stories

OpenResty XRay Dec 23, 2025

Nginx Reverse Proxy QPS Dropped 15x: A Missing upstream keepalive and an -O0 Debug Build

A 15x Slower Nginx Reverse Proxy — and No Errors in the Logs
Flame Graphs Expose a Connection Storm: The Missing upstream keepalive
The Remaining 10% Gap: Baseline Comparison Points to the Compiler
How an -O0 Debug Build Cost Us 10% of Performance

OpenResty XRay Oct 10, 2025

Non-Invasive Java Profiler: Capture Method Arguments in Production Without a Java Agent

Why Non-Invasive Java Profiling Matters in Production
Hands-on Demo: Capturing Java Method Arguments in Production
How OpenResty XRay Differs from Common Java Profilers
Frequently Asked Questions

OpenResty XRay Feb 16, 2023

The Wonderland of Dynamic Tracing (Part 1 of 3)

Dynamic Tracing
What It Is
Too Good to be True?
How it Works
Still Having Doubts?
The Advantages of Dynamic Tracing
DTrace
SystemTap
DTrace and SystemTap
Applications of SystemTap in Production

OpenResty XRay Aug 4, 2020

How OpenResty and Nginx Shared Memory Zones Consume RAM

Slabs and pages
What is allocated is not what is paid for
Fake Memory Leaks
HUP reload

OpenResty XRay Jan 21, 2020

Nginx Memory Usage Explained: Where the RAM Actually Goes

How to Check Nginx Memory Usage
On The System Level
On The Application Level
For Traditional Nginx Servers
FAQ: How Much Memory Does Nginx Need?

OpenResety Edge Jul 20, 2026

CDN for Live Streaming: Surviving Peak Events Without Peak-Event Bills

Why live streams crash at peak: running day-to-day doesn’t mean surviving the peak
How a private CDN turns peak stability from probability into certainty
Live streaming CDN cost comparison: surviving the peak isn’t paying for the peak
The real cost of a private CDN: not the same as building from scratch
Beyond delivery: what a live streaming scenario needs from the same gateway layer
FAQ

OpenResty XRay Jul 15, 2026

OpenResty XRay Version 26.7.15. Now Available

Key Highlights
Other Important Updates

OpenResty XRay Jul 14, 2026

OpenResty XRay AI Assistant: Making Every Piece of Analysis Data Speak

How Is It Different from Pasting a Report into ChatGPT?
Three Typical Scenarios
FAQ: Can AI Really Read a Flame Graph? How Reliable Is It?

OpenResty XRay Jul 8, 2026

OpenResty Private Libraries: High-Performance Lua & Nginx Modules

The Full Catalog
What’s Inside, by Scenario
How Licensing Works
FAQ

OpenResety Edge Jul 8, 2026

Building a Self-Hosted Live Streaming CDN for HLS with OpenResty Edge

Why live HLS breaks a naive caching setup
Building it on OpenResty Edge: two page rules with opposite TTLs
The most critical step: the Use stale proxy cache action
A shield tier with gateway partitions: collapsing to one fetch network-wide
Verifying the configuration and load testing
FAQ

OpenResty XRay Dec 29, 2023

How to Diagnose 504 Gateway Timeout Errors in OpenResty & Nginx

Confirm HTTP 504 gateway timeout errors in the OpenResty/Nginx access log
Diagnose the 504 root cause with OpenResty XRay Guided Analysis
Slow upstream, slow network link, or a too-short timeout setting
Automatic root-cause reports on the Insights page

OpenResty XRay Dec 25, 2023

How CPU Time is Spent inside Go’s CockroachDB (using OpenResty XRay)

Problem: high CPU usage
Use the guidede analysis feature of OpenResty XRay to spot the most CPU-intensive Go code paths
Automatic analysis and reports
What is OpenResty XRay

OpenResty XRay Dec 25, 2023

Performance Overhead of OpenResty XRay when Tracing Perl Apps

Process Performance Before Running Analysis
Performance Impact When the Analyzer is Running
Impact Measurement on Throughput and Latency
What is OpenResty XRay

OpenResty XRay Dec 15, 2023

Locate the Largest Memory Objects in a Live Perl Process

Symptom: a Perl process using high memory in top
Profile the process with OpenResty XRay guided analysis to find the largest Perl objects
Trace the largest object back to its source file
Monitor Perl process memory automatically with Insights reports
FAQ
What is OpenResty XRay

OpenResty XRay Dec 7, 2023

Measuring the Performance Overhead of OpenResty XRay When Profiling Go Applications

Process Performance Before Running Analysis
Performance Impact When the Analyzer is Running
Impact Measurement on Throughput and Latency
What is OpenResty XRay

Related Articles

How to Diagnose 504 Gateway Timeout Errors in OpenResty & Nginx

How CPU Time is Spent inside Go’s CockroachDB (using OpenResty XRay)

Performance Overhead of OpenResty XRay when Tracing Perl Apps

Locate the Largest Memory Objects in a Live Perl Process

Measuring the Performance Overhead of OpenResty XRay When Profiling Go Applications

One String Value Crashed Asia's Biggest Streaming Site — We Found It with OpenResty XRay

Binary Vulnerability Scanning: Catch Backported Patches, Cut False Positives

Introduction to OpenResty XRay

Nginx Reverse Proxy QPS Dropped 15x: A Missing upstream keepalive and an -O0 Debug Build

Non-Invasive Java Profiler: Capture Method Arguments in Production Without a Java Agent

The Wonderland of Dynamic Tracing (Part 1 of 3)

How OpenResty and Nginx Shared Memory Zones Consume RAM

Nginx Memory Usage Explained: Where the RAM Actually Goes

CDN for Live Streaming: Surviving Peak Events Without Peak-Event Bills

OpenResty XRay Version 26.7.15. Now Available

OpenResty XRay AI Assistant: Making Every Piece of Analysis Data Speak

OpenResty Private Libraries: High-Performance Lua & Nginx Modules

Building a Self-Hosted Live Streaming CDN for HLS with OpenResty Edge

How to Diagnose 504 Gateway Timeout Errors in OpenResty & Nginx

How CPU Time is Spent inside Go’s CockroachDB (using OpenResty XRay)

Performance Overhead of OpenResty XRay when Tracing Perl Apps

Locate the Largest Memory Objects in a Live Perl Process

Measuring the Performance Overhead of OpenResty XRay When Profiling Go Applications

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