HttpRunner 3.x （四）：post请求类型application/x-www-from-urlencoded

config:
    name: www类型
    base_url: http:192.168.9.21/

teststeps:
-
    name: step1
    request:
        method: post
        headers:
            Content-type: application/x-www-form-urlencoded  # 默认带上
        url: /api
        data:    # 用data
            username: test
            password: "123456"