GitHub - bramp/NanoHTTPd: A free, simple, tiny (1 java file!), nicely embeddable HTTP server in Java.

A simple, tiny, nicely embeddable HTTP 1.0 (partially 1.1) server in Java Adapted for Android!

NanoHTTPD version 1.25 (android edition),

Features & limitations

Only one Java file
Released as open source, Modified BSD licence
No fixed config files, logging, authorization etc. (Implement by yourself if you need them.)
Supports parameter parsing of GET and POST methods (+ rudimentary PUT support in 1.25)
Supports both dynamic content and file serving
Supports file upload (since version 1.2, 2010)
Supports partial content (streaming)
Supports ETags
Never caches anything
Doesn't limit bandwidth, request time or simultaneous connections
Default code serves files and shows all HTTP parameters and headers
File server supports directory listing, index.html and index.htm
File server supports partial content (streaming)
File server supports ETags
File server does the 301 redirection trick for directories without '/'
File server supports simple skipping for files (continue download)
File server serves also very long files without memory overhead
Contains a built-in list of most common mime types
All header names are converted lowercase so they don't vary between browsers/clients

Run as a standalone app, serves files and shows requests
Subclass serve() and embed to your own program (see HelloServer.java for a simple example)
Call serveFile() from serve() with your own base directory