Tornado PUT 请求缺少主体

Question

我正在尝试使用tornado的ASyncHTTPClient发起一个PUT请求，代码大概是这样的：

  data = { 'text': 'important text',
           'timestamp': 'an iso timestamp' }

  request = tornado.httpclient.HTTPRequest(URL, method = 'PUT', body = urllib.urlencode(data))

  response = yield Task(tornado.httpclient.ASyncHTTPClient().fetch, request)

但是，当请求到达我想要的地址时，似乎没有发送请求体，尽管我在上面已经正确地编码和定义了这个请求体。请问我是不是漏掉了什么？

---

Answer 1

这是一个发送请求的示例，期待得到JSON格式的响应！可以试试这个：

    @gen.coroutine
    def post(self):
        http_client = AsyncHTTPClient()
        http_client = tornado.httpclient.AsyncHTTPClient()

        URL = "http://localhost:1338/api/getPositionScanByDateRange"
        data = {"startDate":"2017-10-31 18:30:00","endDate":"2018-02-08 12:09:14","groupId":3} #A dictionary of your post data
        headers = {'Content-Type': 'application/json; charset=UTF-8'}

        record = yield http_client.fetch(URL, method = 'POST', headers = headers, body = json.dumps(data))

        if record.error:
            response = record.error
        else:
            response = record.body
        self.set_header('Content-Type', 'application/json')
        self.finish(response)

Answer 2

这个问题可能出在另一端。
下面这个用Tornado 2.4.1做的测试得到了预期的结果。

import logging
import urllib

from tornado.ioloop import IOLoop
from tornado.web import Application, RequestHandler, asynchronous
from tornado.httpclient import HTTPRequest, AsyncHTTPClient
from tornado import gen, options

log = logging.getLogger()
options.parse_command_line()

class PutBodyTest(RequestHandler):
    @asynchronous
    @gen.engine
    def get(self):
        data = {
            'text': 'important text',
            'timestamp': 'a timestamp'
        }
        req = HTTPRequest(
            'http://localhost:8888/put_body_test',
            method='PUT',
            body=urllib.urlencode(data)
        )
        res = yield gen.Task(AsyncHTTPClient().fetch, req)
        self.finish()

    def put(self):
        log.debug(self.request.body)

application = Application([
    (r"/put_body_test", PutBodyTest),
])

if __name__ == "__main__":
    application.listen(8888)
    IOLoop.instance().start()

日志输出：

$ python put_test.py --logging=debug
[D 130322 11:45:24 put_test:30] text=important+text&timestamp=a+timestamp
[I 130322 11:45:24 web:1462] 200 PUT /put_body_test (127.0.0.1) 0.37ms
[I 130322 11:45:24 web:1462] 200 GET /put_body_test (::1) 9.76ms

Answer 3

如果另一端在期待接收JSON格式的数据，你可能需要设置一个“内容类型”头信息。可以试试这样做：

data = { 'text': 'important text',
       'timestamp': 'an iso timestamp' }

headers = {'Content-Type': 'application/json; charset=UTF-8'}

request = tornado.httpclient.HTTPRequest(URL, method = 'PUT', headers = headers, body = simplejson.dumps(data))

response = yield Task(tornado.httpclient.ASyncHTTPClient().fetch, request)

这样，头信息就告诉服务器你要发送的是JSON格式的数据，而数据的内容是可以被解析成JSON的字符串。