server['request'] is basically an instantiation of HTTPRequest class.

Here are some of interesting objects in addition to those in Headers and Cookies and Body and POST:

@app.route('/hello')
async def hello_world(**server):
    request = server['request']

    print('REMOTE_ADDR:',    request.ip)
    print('HTTP_HOST:',      request.host)
    print('REQUEST_METHOD:', request.method)
    print('REQUEST_SCHEME:', request.scheme)
    print('REQUEST_URI:',    request.url)
    print('PATH:',           request.path)
    print('QUERY:',          request.query)
    print('QUERY_STRING:',   request.query_string)
    print('VERSION:',        request.version)

    yield b'Hello'
    yield b'World!'

print result on http://localhost:8000/hello?a=1&b=2

REMOTE_ADDR:    b'127.0.0.1'
HTTP_HOST:      bytearray(b'localhost:8000')
REQUEST_METHOD: bytearray(b'GET')
REQUEST_SCHEME: b'http'
REQUEST_URI:    bytearray(b'/hello?a=1&b=2')
PATH:           bytearray(b'/hello')
QUERY:          {'a': ['1'], 'b': ['2']}
QUERY_STRING:   bytearray(b'a=1&b=2')
VERSION:        bytearray(b'1.1')

Note that Tremolo focuses on bytes-like, except in some dict objects like request.query, request.cookies, and request.form().

This is for maximum interoperability, to reduce the possibility of encoding - decoding back and forth, etc. With the tradeoff of being a bit inconvenient.

FYI, request.ip is not security wise. It will take the ip address from X-Forwarded-For / HTTP header when available.

It only becomes handy when Tremolo is deployed behind a proxy server, otherwise request.client[0] should be used.