Built by Abstract: powerful API's for every use case.
Learn more 🚀

HTTP Status Code
426 - Upgrade Required

4xx Client errors

The HTTP Status Code 426 means that the client should switch to a different protocol such as TLS/1.0, as given in the Upgrade header field.‍

Additional Links and Codes Related to Status Code 426
407 - Proxy Authentication Required
416 - Range Not Satisfiable
408 - Request Timeout
502 - Bad Gateway

Written by Benjamin Bouchet on Sep 12, 2020 and last updated at Sep 23, 2021.

← View all HTTP Status Codes

Let's send your first API call.

Get your API key in 10 seconds and start automating workflows.
Get started
API's to LOOK UP
Weather APIMarket Data APIIP Geolocation APIExchange Rate APIPublic Holidays APICompany Enrichment APITime, Date, Timezone APILanguage Translation API
API's to Create
User Avatar APIWeb Scraping APILink Shortener APIImage Processing APIWebsite Screenshot API
API's to validate
IBAN Validation APIEmail Validation APIPhone Validation APIVAT Validation & Rates API
Resources
Free GDPR Cookie BannerHTTP Status Code GuideWhat is my IP address?Email Regex GuideAPI Guides & TipsAPI GlossaryFull API List
company
Contact UsFacebookLinkedinTwitterLegalGDPR & CCPA
Work with us
🚀 We're hiring a CTO / engineering lead!Publish your API on AbstractJoin our affiliate programWrite a guest post
The API Company
Made in San Francisco & Paris