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Clojure HTTP server/client library with WebSocket support
...Each connection costs nothing but a few kB of memory. RAM usage grows O(n) with connections. Written from the ground-up to be lean, the entire client/server is available as a single ~90kB JAR with zero dependencies and ~3k lines of (mostly Java) code. Synchronous is simple. Asynchronous is fast & flexible.
Fast, lightweight Web framework based on Netty; without too much dependency, and the core jar package is only 30KB. Configuration files can also be read in multiple environments, just add VM parameters, also ensure that the parameter name and file name are consistent.
(Really) Thin HTTP Client: no https, small jar file size (never over 25kb), no dependencies (just jre1.6+ or jdk1.6+), can do POST and GET request methods, can send POST methods with multipart/form-data, can send request parameters and fast. Get it!