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Proxy guides, experiments & operator notes
Engineering guides and first-party measurements for people operating proxy-backed data systems.
- 01Guides20
- 02Tutorials13
- 03Comparisons5
- 04Research5
Newest update Aug 09, 2026 · methodology-open research
Rotating Proxy Free Trials: Buyer Test Checklist
Use a controlled proxy-trial scorecard to test rotation, sticky sessions, usable responses, billing, support, and stop conditions before buying.
12 min readRead articleGuides
20 entries
403 Forbidden Error: What It Means and How to Fix It
A 403 Forbidden error means the server understood your request and refused it. What causes it, and the fix for visitors, developers, and...
12 min readRead
429 Error Code (Too Many Requests): How to Fix It
HTTP 429 means you sent requests faster than the server allows. What triggers it, how long it lasts, and the fix for users, developers...
11 min readRead
What Is Captive.apple.com? Apple's Wi-Fi Check Explained
Captive.apple.com is how Apple devices detect Wi-Fi login pages. Why it pops up, what the Success page means, and fixes when portals stick.
10 min readRead
Error 1015: You Are Being Rate Limited (How to Fix It)
Error 1015 is Cloudflare enforcing a site's rate limit at the edge. Why you tripped it, how long it lasts, and fixes for visitors and...
10 min readRead
Error 1020 Access Denied: Causes and How to Fix It
Error 1020 means a site's own firewall rule refused your request at the edge. Why you matched it, and the one thing that actually...
12 min readRead
Error 522: Connection Timed Out and Whose Fault It Is
Error 522 means a CDN edge could not get a usable connection to the site's origin. Why it is almost never the visitor's fault, and the...
12 min readRead
What Is Msftconnecttest.com and Why Does It Redirect?
Msftconnecttest.com is how Windows checks for internet access. Why it is not malware, why the redirect tab opens, and the fixes that work.
12 min readRead
What Is Doubleclick.net? Google's Ad and Tracking Domain
Doubleclick.net is Google's ad serving and measurement domain. Why it loads on sites you visit, whether it is malware, and what limiting...
12 min readRead
What Is Gstatic.com? Google's Static Content Domain
Gstatic.com is Google's cookieless domain for static files like fonts and scripts. What it does, why devices ping it, and what breaks if...
10 min readRead
Proxy Ports Explained: Why the Number Is Convention
A proxy port number is a convention, not a promise. Learn what 8080, 3128, and 1080 mean and how to tell a wrong-port error from a...
7 min readRead
What Are Backconnect Proxies? One Gateway, Many Exits
A backconnect proxy is one gateway address in front of a rotating pool of exits. See the architecture demonstrated on a local gateway.
8 min readRead
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