Differences between gRPC, SSE, WebSockets

 The primary difference is their architectural purpose: gRPC is a high-performance framework designed mainly for internal backend microservices, WebSockets provide a persistent channel for two-way (bidirectional) web apps, and SSE (Server-Sent Events) is a simple protocol for one-way (server-to-client) streaming.

gRPC (Google Remote Procedure Call)How it works: A client invokes a function on a remote server as if it were a local function call. It relies strictly on HTTP/2, utilizing features like multiplexing to send multiple requests over one connection without blocking.Payload: Uses Protocol Buffers, which serialize data into a highly compressed binary format instead of readable text. This makes it lightning-fast but harder to debug manually.Strengths: Strict schema enforcement, type safety, and extreme data efficiency for internal backend networks.

WebSocketsHow it works: The client initiates a standard HTTP request and requests a protocol upgrade. Once accepted, the connection morphs into a persistent, raw TCP tunnel where both parties can push messages at any time simultaneously.Payload: Completely flexible. You can stream plain text, raw JSON strings, or binary blobs.Strengths: Low latency for high-frequency, two-way browser data exchanges.

SSE (Server-Sent Events)How it works: The client opens a standard, long-lived HTTP connection using the native browser EventSource interface. The server leaves this response window open indefinitely, pushing text events whenever new data updates arrive.Payload: Text-only. If you need to send binary data, it must be base64 encoded.Strengths: Minimal configuration, standard HTTP firewall compliance, and native handling of drops/reconnections out of the box

Which One to Choose?Choose gRPC if you are linking backend-to-backend infrastructure or mobile apps where network bandwidth and CPU cycles are highly constrained.Choose WebSockets if your client needs to constantly stream data back up to the server while receiving updates, such as inside a fast-paced multiplayer web game or a shared document editor.Choose SSE if your client just needs to sit back and listen to an outgoing feed, such as tracking a live sports score, waiting for system push notifications, or streaming real-time tokens from a Generative AI text API.