> ## Documentation Index > Fetch the complete documentation index at: https://moeck.io/llms.txt > Use this file to discover all available pages before exploring further. # MockServer > Mock and proxy any HTTP or HTTPS service with ease. Set up expectations, verify requests, and debug traffic — in Java, JavaScript, Ruby, or via the REST API. MockServer lets you mock any system you integrate with over HTTP or HTTPS, and proxy live traffic for inspection and debugging. Use it in tests, local development, or CI pipelines to isolate dependencies and control responses. Get MockServer running and mock your first request in under 5 minutes. Deploy via Docker, Helm, Maven, npm, or as a standalone JAR. Define request matchers and response actions to control what MockServer returns. Explore the full REST API for managing expectations, verification, and state. ## How MockServer works MockServer acts as a controllable HTTP server. You configure it with **expectations** — rules that match incoming requests and define what response to return. You can then verify which requests were received after your tests run. Run MockServer via Docker, as a JAR, or embedded in your test framework. Use a client library or the REST API to define how MockServer should respond to requests. Point your application at MockServer. It intercepts requests and returns your configured responses. Assert that your application made the expected calls — method, path, headers, body, and more. ## Explore by use case Auto-generate expectations from an OpenAPI v3 specification. Return dynamic responses using Mustache, Velocity, or JavaScript templates. Proxy live traffic, record requests and responses, then replay them. Use the Java, JavaScript, or Ruby client to control MockServer programmatically.