我的flask代码如下:

@app.route('/sheets/api',methods=["POST"])
def insert():
    if request.get_json():
        return "
Works! 
"
    else:
        return "
Does not work.
"

当请求是:

POST /sheets/api HTTP/1.1
Host: localhost:10080
Cache-Control: no-cache

{'key':'value'}

结果是

Does not work.

当我添加Content-Type标题时:

POST /sheets/api HTTP/1.1
Host: localhost:10080
Content-Type: application/json
Cache-Control: no-cache

{'key':'value'}

我收到400错误.

我究竟做错了什么？

您没有发布有效的JSON.JSON字符串使用双引号:

{"key":"value"}

使用单引号时,字符串无效JSON,并返回400 Bad Request响应.

演示仅实现您的路线的本地Flask服务器:

>>> import requests
>>> requests.post('http://localhost:5000/sheets/api', data="{'key':'value'}", headers={'content-type': 'application/json'}).text
'\n\n
Bad Request
\n
The browser (or proxy) sent a request that this server could not understand.
\n'
>>> requests.post('http://localhost:5000/sheets/api', data='{"key":"value"}', headers={'content-type': 'application/json'}).text
'
Works! 
'