w5100test2.py

def main():
    import network, socket, ujson
    from machine import Pin
    nic = network.WIZNET5K(pyb.SPI(2), Pin('PB12'), Pin('PC8'))
    addr = socket.getaddrinfo('api.fixer.io',80)[0][-1]
    s = socket.socket()
    s.connect(addr) 
    s.send(bytes('GET /latest?base=USD&symbols=JPY HTTP/1.0\r\nHost: api.fixer.io\r\n\r\n', 'utf8'))
    result = s.recv(1000)
    s.close()
    lines = result.splitlines()
    pos = lines.index(b'')
    parsed = ujson.loads(lines[pos + 1])
    print(parsed["date"])
    print("JPY/" + parsed["base"] + ": " + str(parsed["rates"]["JPY"]))

http://blog.boochow.com/article/454179047.html