What are the differences between HTTP and HTTPS?
HTTP is the set of rules used by websites to transfer resources such as text, images, and videos to the user. When you visit a website, your browser sends an HTTP request to the server, and the server responds with an HTTP response.
The Danger of Plain Text
The biggest flaw of the HTTP protocol is that it transmits data in plain text. Since the data is not encrypted, any third party monitoring the network traffic between the user and the server (such as someone on the same Wi-Fi network or an internet service provider) can easily read all transmitted passwords, credit card information, and messages. This type of attack is called a Man-in-the-Middle (MitM) attack.
What is HTTPS and How is the Security Layer Provided?
HTTPS is the secure version of the traditional HTTP protocol, combined with the SSL (Secure Sockets Layer) or its current successor, the TLS (Transport Layer Security) encryption protocol. HTTPS offers three core layers of protection to ensure data flows securely across the internet:
1. Encryption
HTTPS encrypts all communication between the browser and the server. This ensures that even if data is intercepted along the way, it appears only as a meaningless string of characters. Only the authorized parties (the browser and the server) possess the correct keys to decrypt the data.
2. Data Integrity
Data cannot be modified or corrupted during transit. If an attacker attempts to alter the data mid-route, the HTTPS system detects it immediately and drops the connection.
3. Authentication
It proves that the user is actually connecting to the intended website. This prevents fraudsters from setting up fake websites (Phishing) to deceive users.
Key Differences Between HTTP and HTTPS
The differences between the two protocols go beyond security; they also directly impact performance and Search Engine Optimization (SEO).
Port Numbers
- HTTP: Uses port 80 by default for communication.
- HTTPS: Uses port 443 by default for secure data transmission.
SSL/TLS Certificate Requirement
To use HTTPS, a website must have an SSL/TLS Certificate issued by an authorized organization known as a Certificate Authority (CA). There is no such requirement for HTTP.
SEO and Search Engine Ranking
Search engines, especially Google, place great importance on user security. HTTPS is an official SEO ranking factor. Websites using HTTPS gain an advantage in search results over competitors using HTTP.
Browser Warnings and User Trust
Modern web browsers (Chrome, Safari, Edge, etc.) mark websites using HTTP as "Not Secure" in the address bar. Websites using HTTPS display a padlock icon. This directly influences user trust and conversion rates.
Performance Advantages of HTTPS: HTTP/2 and HTTP/3
In the past, it was thought that HTTPS slowed down websites due to encryption processes. However, in today's technology, the exact opposite is true. Modern performance protocols make HTTPS mandatory.
HTTP/2 Support
The HTTP/2 protocol allows websites to load much faster than the old HTTP/1.1. It permits multiple requests to be sent simultaneously over a single connection (Multiplexing). Browsers support the HTTP/2 protocol only over HTTPS connections. Therefore, if your site is not HTTPS, you cannot benefit from this speed advantage.
HTTP/3 and the QUIC Protocol
The latest standard in web performance, HTTP/3, takes connection speed and stability to the peak. It uses QUIC (UDP-based) protocol instead of TCP. HTTP/3 integrates its security mechanism (TLS 1.3) directly within itself. This enables a faster "handshake" and prevents connection drops when switching between mobile networks (e.g., from Wi-Fi to 4G). HTTP/3 is also entirely based on HTTPS.
