{"id":62759,"library":"http4s-core-2-13","title":"Http4s Core","description":"Core library for building HTTP servers and clients using functional Scala.","status":"active","version":"0.23.34","language":"java","source_language":null,"source_url":"https://github.com/http4s/http4s","tags":["http","server","client","functional","scala"],"install":[{"cmd":"<dependency>\n  <groupId>org.http4s</groupId>\n  <artifactId>http4s-core_2.13</artifactId>\n  <version>0.23.34</version>\n</dependency>","lang":"xml","label":"Maven"},{"cmd":"implementation 'org.http4s:http4s-core_2.13:0.23.34'","lang":"groovy","label":"Gradle"}],"dependencies":[],"imports":[{"symbol":"HttpRoutes","correct":"org.http4s.HttpRoutes"}],"quickstart":{"code":"import org.http4s.HttpRoutes;\nimport org.http4s.dsl.io._;\n\nval routes = HttpRoutes.of[IO] {\n  case GET -> Root / \"hello\" => Ok(\"Hello, world!\")\n}","lang":"scala","description":"Define a simple HTTP route that responds with 'Hello, world!'."},"warnings":[{"fix":"Refer to the http4s migration guide for cats-effect 3 updates.","message":"Http4s 0.23.x uses cats-effect 3; migration from 0.21.x requires significant changes.","severity":"breaking","affected_versions":"<0.23"}],"env_vars":null,"search_vec":"'build':6 'client':10,16 'core':2,3 'function':12,17 'http':7,14 'http4s':1 'librari':4 'scala':13,18 'server':8,15 'use':11","created_at":"2026-06-17T16:35:12.851147+00:00","updated_at":"2026-06-17T16:35:12.851147+00:00","problems":[],"ecosystem":"maven","meta_description":null,"install_score":null,"quickstart_score":null,"quickstart_tag":null,"pypi_latest":null,"cli_name":null,"cli_version":null,"type":"library","homepage":"https://http4s.org/","github":"https://github.com/http4s/http4s","docs":"https://appdoc.app/artifact/org.http4s/http4s-core_2.13/","changelog":null,"pypi":null,"npm":null,"openapi_spec":null,"status_page":null,"smithery":null,"categories":["web-framework"],"base_url":null,"auth_type":null,"provenance":{"verified_status":null,"verified_at":null,"last_verified":"2026-06-17","next_check":"2026-12-14","install_tag":null}}