HTTP vs HTTPS: What's the difference?
HTTP carries web traffic without transport encryption, while HTTPS protects HTTP with TLS.
HTTP
HTTP sends requests and responses without native confidentiality or server authentication at the transport layer.
HTTPS
HTTPS uses TLS to encrypt traffic, protect integrity in transit and authenticate the server with a certificate.
Key differences between HTTP and HTTPS
| Decision factor | HTTP | HTTPS |
|---|---|---|
| Encryption | No transport encryption by default. | HTTP carried inside a TLS-protected connection. |
| Server authentication | No TLS certificate validates the destination identity. | The server presents a certificate that clients validate against trusted authorities or configured trust. |
| Integrity in transit | Traffic can be read or altered by an on-path attacker. | TLS protects confidentiality and integrity while data is in transit. |
Choose HTTP if
Use plain HTTP only in tightly controlled cases such as local redirects or isolated testing where no sensitive data is exposed.
Choose HTTPS if
Use HTTPS for any public website or application and for any traffic that carries credentials or sensitive data.
Practical example
A user submits credentials to a website. Over plain HTTP, anyone able to observe the network path could potentially read or modify the request. HTTPS encrypts the session and validates the server certificate, protecting the transport even across untrusted networks.
Can you use HTTP and HTTPS together?
Public sites commonly redirect HTTP to HTTPS so old links and typed hostnames still reach the secure version. The HTTP listener should perform the redirect without serving sensitive content. Internal services should also use TLS when credentials or business data are involved.
Common mistake to avoid
The padlock does not prove that a website is legitimate; phishing sites can obtain valid TLS certificates too. HTTPS protects the connection to the named site. Application vulnerabilities, compromised accounts and malicious content still require separate controls.
Key takeaway
HTTPS is essential for web security, but it protects the connection rather than proving that the application itself is trustworthy or vulnerability-free.
Frequently asked questions
Does HTTPS stop phishing?
No. It protects transport security, but a phishing site can also use HTTPS. Users and security controls must still validate the destination and content.
Should internal websites use HTTPS?
Yes when they handle credentials, administration or sensitive data, and increasingly as a general baseline. Internal certificate management should be designed properly.
Why keep port 80 open at all?
Many sites keep HTTP only to perform a minimal redirect to HTTPS and to support certificate-validation workflows where appropriate.