Comparing HTTP and RPC for Remote Calls in Spring Cloud
Spring Cloud can use either HTTP‑based REST calls, which offer flexible, language‑agnostic JSON communication and simpler implementation, or RPC over TCP, which provides faster, binary‑serialized calls that appear local but require tighter API contracts, so modern microservices usually prefer HTTP for its adaptability and scalability.
Spring Cloud runs on an embedded Tomcat container, handling requests via HTTP. JSON exchange enables flexible, cross‑platform data handling for mobile H5, apps, and mini‑programs. A simple Java HTTP server demonstrates basic request processing.
RPC uses TCP with a three‑way handshake and binary serialization, suitable for stable data formats but less flexible than HTTP for frequent changes.
RESTful defines architectural constraints; although not limited to HTTP, it is commonly implemented with HTTP.
Differences: RPC makes remote calls look local, requiring API wrappers; HTTP leaves request/response details to developers, offering more flexibility and language independence. Pros: RPC transparency; HTTP flexibility and cross‑platform support. Cons: RPC’s API encapsulation limits language choices.
Selection considers speed (RPC can be faster, HTTP can be compressed), complexity (HTTP simpler), and flexibility (HTTP more adaptable). Modern microservices favor HTTP‑based REST services for autonomy and scalability.
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