AI BriefingHTTPS Applied by Default
Key point
Replit strengthens security and privacy by applying HTTPS to all servers by default.
Details
Replit is introducing an HTTPS-first policy for all server repls. Now, without any additional configuration from users, Replit's proxy redirects all HTTP requests to HTTPS, and security is reinforced through HSTS (HTTP Strict Transport Security) headers.
Certificate issuance is performed automatically from Let's Encrypt via the ACME protocol. Replit manages approximately 500,000 HTTPS certificates and uses two verification methods:
- HTTP-01: Used for issuing certificates for custom domains, verified by providing a token at a specific path on the domain.
- DNS-01: Used for issuing wildcard certificates such as
*.<user>.repl.co. This allows users to efficiently manage a single certificate even when operating multiple servers.
Certificates are valid for 90 days, and the automatic renewal process begins 30 days before expiration. To manage rate limits from ACME providers, Replit operates a conservation mode that temporarily delays renewals during periods of concentrated certificate renewal, ensuring system stability.
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