What are the differences between HTTP/1.1 and HTTP/2?

Main differences between HTTP/1.1 and HTTP/2:

• Binary protocol: HTTP/2 uses a binary format instead of text, making parsing more efficient and error-resistant.
• Multiplexing: HTTP/2 allows multiple requests and responses to be sent simultaneously over a single TCP connection. In HTTP/1.1, multiple connections were required for parallel requests, leading to issues like head-of-line blocking.
• Header compression (HPACK): HTTP/2 compresses HTTP headers using the HPACK algorithm, reducing overhead and improving performance.
• Stream prioritization: HTTP/2 enables clients and servers to assign priorities to different data streams, ensuring faster loading of critical resources.
• Server Push: HTTP/2 allows servers to send resources to clients before they are explicitly requested, significantly reducing page load times.

Summary table of differences:

Feature	HTTP/1.1	HTTP/2
Protocol format	Text	Binary
Request connections	Multiple	Single TCP connection
Multiplexing	No	Yes
Header compression	No (usually)	HPACK
Prioritization	No	Yes
Server Push	No	Yes