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https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-411-status-code/
411 Length Required - HTTP Status Code Glossary - WebFX
HTTP Status Code 411: The server refuses to accept the request without a defined Content-Length.
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https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-428-status-code/
428 Precondition Required - HTTP Status Code Glossary - WebFX
HTTP Status Code 428: The origin server requires the request to be conditional.
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https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-511-status-code/
511 Network Authentication Required - HTTP Status Code Glossary
HTTP Status Code 511: The client needs to authenticate to gain network access.
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https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-426-status-code/
426 Upgrade Required - HTTP Status Code Glossary - WebFX
Don't know what a 426 status code means? View our HTTP Status Code glossary to review the details of this upgrade required code!
required http statuscode glossary webfx426upgrade
https://http.dev/496
496 SSL Certificate Required - HTTP status code explained
Apr 4, 2026 - Fix nginx 496 SSL Certificate Required errors. Learn client certificate requirements and mutual TLS setup.
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https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-402-status-code/
402 Payment Required - HTTP Status Code Glossary - WebFX
HTTP Status Code 402: Reserved for future use.
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https://httpstatusdogs.com/426-upgrade-required
426 Upgrade Required - HTTP Status Dogs
HTTP Status Dogs. Hypertext Transfer Protocol Response status codes. And dogs.
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https://http.dev/402
402 Payment Required - HTTP status code explained
Apr 4, 2026 - Understand 402 Payment Required: a reserved status code, its non-standard usage by Shopify and Stripe, and SEO impact.
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