Which Java HTTP client should I use in 2024?

HTTP protocol integration is essential for many Java projects, necessitating the use of HTTP clients, of which there are numerous options in the Java ecosystem. This overview highlights major libraries, excluding higher-level wrappers like Spring's RestTemplate, to aid in selecting the right client based on common criteria such as features, API style, quality, maintenance, security, and performance. Key considerations include whether clients support synchronous or asynchronous calls, HTTP/2, various authentication protocols, transparent content compression, caching, and Websockets. Configuration options are crucial, especially since some clients only allow certain parameters to be set globally as system properties, which can complicate integration with other systems. Notable clients discussed are Java's HttpURLConnection, Java HttpClient, Apache HTTPClient, OkHttpClient, AsyncHttpClient, and Jetty HttpClient, each with its unique strengths and weaknesses. The article recommends avoiding HttpURLConnection unless necessary and suggests Square's OkHttpClient as a default choice due to its robust features, configurability, and reliable performance in production environments, while noting WireMock Cloud as a useful tool for testing systems reliant on third-party APIs.

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