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Arpit Bhayani Blogs
001 Ai Topological Sort

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TLDR: Why gRPC Uses HTTP2

Date: 2025-09-24 Source: https://arpitbhayani.me/blogs/grpc-http2

Overview

When Google introduced gRPC in 2015, one of the most significant architectural decisions was building it on top of HTTP/2 rather than the widely adopted HTTP/1.1. This was just about following some trend, but a deliberate choice that fundamentally shapes how gRPC performs and behaves.

Key Points

  • When Google introduced gRPC in 2015, one of the most significant architectural decisions was building it on top of HTTP/2 rather than the widely adopted HTTP/1.1.
  • What Makes HTTP/2 Different: Before diving into gRPC’s specific needs, let’s understand what HTTP/2 brings to the table that HTTP/1.1 doesn’t.
  • gRPC’s Core Requirements: Bidirectional Communication gRPC supports four types of RPC calls: HTTP/1.1 simply cannot handle streaming scenarios effectively.
  • Performance: Connection Management Consider a microservices application with 10 services, each making an average of 5 calls to other services under load.
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  • Streaming: Server Streaming Example Consider a log streaming service: HTTP/1.1 Approach: HTTP/2 Approach: (explained below) frames The HTTP/2 implementation is not only simpler but also more robust and efficient.
  • Trade-offs: When HTTP/2 Might Not Be Ideal Single Request Scenarios - For simple, one-off requests, HTTP/1.1 might have lower latency due to: Resource-Constrained Environments - HTTP/2 requires more memory for: In embedded systems or extremely memory-constrained environments, this overhead might be significant.

    • Takeaway

    gRPC’s adoption of HTTP/2 was a strategic decision that enables the framework’s core value propositions - performance, functionality, and scalability.