如果一个URL返回的不是HTML，而是机器能直接解析的数据，这个URL就可以看成是一个Web API。
在handlers.py中添加API处理函数：

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import re, time, json, logging, hashlib, base64, asyncio
from coroweb import get, post
from models import User, Comment, Blog, next_id

# 参数aiohttp.web.request实例，包含了所有浏览器发送过来的HTTP协议里面的信息
@get('/')
async def index(request):
    summary = 'Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.'
    blogs = [
        Blog(id='1', name='Test Blog', summary=summary, created_at=time.time()-120),
        Blog(id='2', name='Write Sth', summary=summary, created_at=time.time()-3600),
        Blog(id='3', name='Learn Swift', summary=summary, created_at=time.time()-7200)
    ]
    return {'__template__': 'blogs.html', 'blogs': blogs}

@get('/api/users')
async def api_get_users():
    users = await User.findAll(orderBy='created_at desc')
    for u in users:
        u.passwd = '******'
    return dict(users=users)

输入API网址：