英文:
Python make a POST request after the connection is already established
问题
之前我问了一个关于如何在使用Python Requests库之前创建连接的问题：
结果我没有成功。
我现在正在使用httpclient库，并且有以下代码：
import http.client as httplib
params = my_params()
headers = {"Connection": "Keep-Alive"}
conn = httplib.HTTPSConnection("api.domain.com:443")
conn.request("POST", "/api/service", params, headers)
response = conn.getresponse()
我希望它能在进行POST请求之前建立连接。然而，这一行：
conn = httplib.HTTPSConnection("api.domain.com:443")
只花了2毫秒完成，我知道到接收方的延迟大约是95毫秒。所以，我认为这一行并没有创建连接，连接仍然是在POST请求一起创建的。
我该如何在Python中发出POST请求，其中连接在进行POST请求之前已经建立？
类似这样：
conn = https.connect("api.domain.com:443")
# 在进行POST请求之前建立连接
conn.request("POST", "/api/service", params, headers)
英文:
Earlier I a question asking how to create a connection before calling POST, GET etc using the Python Requests library:
turns out I couldn't.
I'm now using the httpclient library and have this:
import http.client as httplib
params = my_params()
headers = {"Connection": "Keep-Alive"}
conn = httplib.HTTPSConnection("api.domain.com:443")
conn.request("POST", "/api/service", params, headers)
response = conn.getresponse()
I was hoping it would establish the connection first. However, the line:
conn = httplib.HTTPSConnection("api.domain.com:443")
is only taking 2ms to complete and I know the latency to the recipient is approximately 95ms. So, I presume this line isn't creating the connection and it's still being created along with the POST.
How can I make a POST request in Python, where the connection is already established before make the POST request?
Something like:
conn = https.connect("api.domain.com:443")
# Connection established before making POST
conn.request("POST", "/api/service", params, headers)
答案1
得分: 2
是的，在http.client库中，当您使用request()方法发出请求时，连接会建立起来。这行代码conn = httplib.HTTPSConnection("api.domain.com:443")创建了连接对象，但并没有建立实际的连接。
如果您想在发出请求之前建立连接，可以使用connect()方法。
像这样：
import http.client as httplib
params = my_params()
headers = {"Connection": "Keep-Alive"}
conn = httplib.HTTPSConnection("api.domain.com:443")
conn.connect()
conn.request("POST", "/api/service", params, headers)
response = conn.getresponse()
conn.close()
来源：https://docs.python.org/3/library/http.client.html#http.client.HTTPConnection.connect
英文:
Yes, in http.client library, the connection is established when you make the request using the request() method. The line conn = httplib.HTTPSConnection("api.domain.com:443") creates the connection object but doesn't establish the actual connection.
If you want to establish the connection before making the request, you can use the connect() method.
Like this:
import http.client as httplib
params = my_params()
headers = {"Connection": "Keep-Alive"}
conn = httplib.HTTPSConnection("api.domain.com:443")
conn.connect()
conn.request("POST", "/api/service", params, headers)
response = conn.getresponse()
conn.close()
Source: https://docs.python.org/3/library/http.client.html#http.client.HTTPConnection.connect
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