Python 如何从我的FastAPI应用程序向另一个站点（API）发送HTTP请求？

我试图一次向服务器发送100个请求

http://httpbin.org/uuid

使用以下代码段

from fastapi import FastAPI
from time import sleep
from time import time
import requests
import asyncio

app = FastAPI()

URL= "http://httpbin.org/uuid"


# @app.get("/")
async def main():
    r = requests.get(URL)
    # print(r.text)
    
    return r.text

async def task():
    tasks = [main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main(),main()]
    # print(tasks)
    # input("stop")
    result = await asyncio.gather(*tasks)
    print (result)

@app.get('/')
def f():
    start = time()
    asyncio.run(task())
    print("time: ",time()-start)

---

我将FastAPI与Asyncio结合使用，以尽可能缩短3秒或更短的时间，但使用上述方法，我得到的总时间为66秒，超过一分钟。我还想保留

main

函数，以便在

r.text

上执行其他操作。我知道要实现如此低的时间，需要并发性，但我不确定我在这里犯了什么错误。

请求

是一个同步库。您需要使用基于

asyncio

的库以异步方式发出数百个请求

httpx.AsyncClient

通常在FastAPI应用程序中用于请求外部服务。它也可用于各种应用。默认情况下使用它

from fastapi import FastAPI
from time import time
import httpx
import asyncio

app = FastAPI()

URL = "http://httpbin.org/uuid"


async def request(client):
    response = await client.get(URL)
    return response.text


async def task():
    async with httpx.AsyncClient() as client:
        tasks = [request(client) for i in range(100)]
        result = await asyncio.gather(*tasks)
        print(result)


@app.get('/')
async def f():
    start = time()
    await task()
    print("time: ", time() - start)

输出

['{\n  "uuid": "65c454bf-9b12-4ba8-98e1-de636bffeed3"\n}\n', '{\n  "uuid": "03a48e56-2a44-48e3-bd43-a0b605bef359"\n}\n',...
time:  0.5911855697631836

aiohttp

也可以在FastAPI应用程序中使用，但如果确实需要，请这样做

from fastapi import FastAPI
from time import time
import aiohttp
import asyncio

app = FastAPI()

URL = "http://httpbin.org/uuid"


async def request(session):
    async with session.get(URL) as response:
        return await response.text()


async def task():
    async with aiohttp.ClientSession() as session:
        tasks = [request(session) for i in range(100)]
        result = await asyncio.gather(*tasks)
        print(result)


@app.get('/')
async def f():
    start = time()
    await task()
    print("time: ", time() - start)

---

如果要限制并行执行的请求数，可以使用

asyncio.semaphore

如下：

MAX_IN_PARALLEL = 10
limit_sem = asyncio.Semaphore(MAX_IN_PARALLEL)


async def request(client):
    async with limit_sem:
        response = await client.get(URL)
        return response.text

---

@Alex Noname很好地使用了异步请求库。如果您想让代码更快，我建议使用asyncio.Queue作为替代方法。在这个例子中，我创造了100个生产者和100个消费者。您可以限制队列中的最大消息数，如，然后生产者等待，直到有空间容纳新消息

asyncio.Queue（maxsize=100）

此外，我还使用了来自httpx的AsyncClient

如果您想了解更多关于队列的信息，我建议您阅读本文

输出

['{\n  "uuid": "a7713d07-ea5d-40d3-95b4-6673f3c50a8b"\n}\n', '{\n  "uuid": "c93f8b89-2c44-40fa-9e5f-736e22ad5f23"\n}\n', '{\n  "uuid": "cbb4ad76-7790-45ae-87f1-e425eddc8021"\n}\n', '{\n  "uuid": "4c1d81c0-ae7d-401a-99df-e98af3651335"\n}\n', '{\n  "uuid": "c5f70738-fbba-4cf9-8fdf-29f8b4eabe63"\n}\n', '{\n  "uuid": "d016b852-4312-4502-a336-a6a110237d1d"\n}\n', '{\n  "uuid": "22d8b00b-4266-4236-b5a3-ed5d7c5be416"\n}\n', '{\n  "uuid": "cd54fdbb-7de9-4df3-90cc-e6b108d5fdf8"\n}\n', '{\n  "uuid": "757f0a26-7896-4a04-bea2-60c66a38b05b"\n}\n', '{\n  "uuid": "72eb6584-21f4-449b-b6bd-d0f88666126f"\n}\n', '{\n  "uuid": "b3deadf5-5b79-491b-829c-0404c306cb68"\n}\n', '{\n  "uuid": "789e7422-493d-49d2-9585-e5ca34b7cf36"\n}\n', '{\n  "uuid": "48d29a82-ff7c-41f5-8af2-42784326a31f"\n}\n', '{\n  "uuid": "84b2d67c-331c-4037-b6e4-c299d93c1899"\n}\n', '{\n  "uuid": "386e79f9-073a-4f27-961c-7befcdf95cd4"\n}\n', '{\n  "uuid": "8dfdb5e4-dd69-4043-b174-48ec8505f36f"\n}\n', '{\n  "uuid": "633e634b-b107-42bb-a7d3-c6bbfff089a0"\n}\n', '{\n  "uuid": "962d665f-8663-4be7-a3c6-9426ba500bf4"\n}\n', '{\n  "uuid": "320fb858-a751-4c34-9cdb-ddd2f4e28efa"\n}\n', '{\n  "uuid": "46a75693-5255-4ac7-8d7a-54910b4d6f68"\n}\n', '{\n  "uuid": "5323734b-7ff9-455e-ba5a-66383e6b9a1f"\n}\n', '{\n  "uuid": "622a579f-35b6-4e4b-9dba-a8a69c2049c8"\n}\n', '{\n  "uuid": "593d5e82-cef3-4be0-99ab-e3034855d7a1"\n}\n', '{\n  "uuid": "80f139df-2a27-40c1-8329-e4faa035c45c"\n}\n', '{\n  "uuid": "a97e084c-4d30-4c7b-a96e-89ed00dcfe2a"\n}\n', '{\n  "uuid": "360d49eb-7222-4064-81c2-6eba2d43a9a5"\n}\n', '{\n  "uuid": "a81b6eab-a646-4e58-b986-96a90baa52aa"\n}\n', '{\n  "uuid": "0160337e-b400-41d6-ae89-aa46c5131f40"\n}\n', '{\n  "uuid": "e600722f-8c15-4959-948b-4c4e5296feb2"\n}\n', '{\n  "uuid": "f15403e4-3674-43b2-a0c9-649fd828ba7e"\n}\n', '{\n  "uuid": "36bf139c-cc18-45a8-bc55-e7f90ce290b5"\n}\n', '{\n  "uuid": "b2368a3c-d86b-4fcd-a0d3-bf7f8f657a83"\n}\n', '{\n  "uuid": "d9f16c36-3572-4c70-8a41-3d4e279d76bf"\n}\n', '{\n  "uuid": "796087cc-a202-40dd-9921-14802a73323d"\n}\n', '{\n  "uuid": "089fa0d7-4c48-4daa-a80d-cb5ebd37dfb7"\n}\n', '{\n  "uuid": "e5582bc7-0f8a-4da7-b640-79a0d812154d"\n}\n', '{\n  "uuid": "bac0640b-0d0b-4bf2-a3c1-36bdda7cce03"\n}\n', '{\n  "uuid": "b4353004-02b2-4846-8692-33dd77ad1d3f"\n}\n', '{\n  "uuid": "1b34a744-d0ea-4acf-8bda-33743800d86a"\n}\n', '{\n  "uuid": "4d9dd269-6ee2-4356-9bc4-ddf188445320"\n}\n', '{\n  "uuid": "a1f380df-0c0d-4aee-bbb7-c3e99fbfe54f"\n}\n', '{\n  "uuid": "7cb762eb-1a42-433d-97ea-aa9de4504e35"\n}\n', '{\n  "uuid": "981c40e2-64bf-4746-8103-9430bda2a5ca"\n}\n', '{\n  "uuid": "22b778eb-82d1-48b9-9874-5ebb80ddb8b1"\n}\n', '{\n  "uuid": "e7a9e0e8-7964-400c-aafe-9c36b9b7e1a0"\n}\n', '{\n  "uuid": "21a59b91-2732-4bb6-a47e-84008a03c20c"\n}\n', '{\n  "uuid": "a78eeb39-5ecb-4509-87c2-b4a2529e3536"\n}\n', '{\n  "uuid": "4a332579-ce03-4f69-9db5-78da9196d6b2"\n}\n', '{\n  "uuid": "55fbc34f-4eb3-4356-98e3-1df38054a4b2"\n}\n', '{\n  "uuid": "257ac454-09c2-4fd4-bdb3-303495360fa2"\n}\n', '{\n  "uuid": "7505cc0d-01b3-47f8-91d4-3e54d0f387de"\n}\n', '{\n  "uuid": "0fd67af2-622e-4688-b3c8-f64e20f1f3ec"\n}\n', '{\n  "uuid": "07653ccf-f408-4807-8ff5-e6098d657451"\n}\n', '{\n  "uuid": "b9d0ff18-fd67-4afa-adbe-ebcb53380804"\n}\n', '{\n  "uuid": "70d4d53b-2f06-41be-bb38-47f010cfa40f"\n}\n', '{\n  "uuid": "a6d49873-e749-4578-ae9c-e6c6f473535d"\n}\n', '{\n  "uuid": "e67efee5-76ad-4812-bb97-016ef9ff87e8"\n}\n', '{\n  "uuid": "67886926-b2d9-44fb-b836-26b81c53e5fb"\n}\n', '{\n  "uuid": "dcbd4ff8-e3cd-4e03-b12d-5fb3834b0e00"\n}\n', '{\n  "uuid": "65c2eaee-5fa2-4b58-a1c3-adeb04d92c71"\n}\n', '{\n  "uuid": "2cee4ec9-952e-45c5-91b7-f4f5848c3455"\n}\n', '{\n  "uuid": "8e94bf1c-ee5a-483a-a962-d0b9aea48c95"\n}\n', '{\n  "uuid": "c1fe17bc-bedf-4c4c-952d-a5921f693d9f"\n}\n', '{\n  "uuid": "221456fd-48ca-4826-a8b5-5fa0b23db6e4"\n}\n', '{\n  "uuid": "62fda759-b382-44e4-ad7d-d19a952fc1c7"\n}\n', '{\n  "uuid": "73faeb91-215e-4e49-8f11-11b98e499cc7"\n}\n', '{\n  "uuid": "f3279c45-ebcc-4079-b823-3efe825c7cf8"\n}\n', '{\n  "uuid": "b892672b-4510-44f4-b61e-9cccaa52421e"\n}\n', '{\n  "uuid": "8926979d-71a7-4171-9389-ddafff89e229"\n}\n', '{\n  "uuid": "d97cef59-4862-42ca-b0f2-261f98fd4b6f"\n}\n', '{\n  "uuid": "3362ff93-89e4-4889-a2f2-2e03771e86ce"\n}\n', '{\n  "uuid": "9f525251-4fe4-4a9c-97b5-2f01d2b37aaf"\n}\n', '{\n  "uuid": "036959d4-3179-40f9-bbf3-32274f2cede2"\n}\n', '{\n  "uuid": "157f8c22-6214-4e27-ab5d-08d39f96d1d3"\n}\n', '{\n  "uuid": "e4bfbf62-7c33-4fd7-a231-47f5ce398041"\n}\n', '{\n  "uuid": "a41512c1-3346-4457-a379-64d690ffc2ea"\n}\n', '{\n  "uuid": "7bb07cfb-294b-44fa-a8dc-6d283c54409f"\n}\n', '{\n  "uuid": "f2297d22-a2d0-47ff-8d65-24c6fe7877a7"\n}\n', '{\n  "uuid": "645e255b-4c93-4c8f-9ff2-43da293db660"\n}\n', '{\n  "uuid": "9190e370-dfa9-47a6-8cef-8df7ab762433"\n}\n', '{\n  "uuid": "83216551-9f1b-48b2-8cd6-fd125a7ce965"\n}\n', '{\n  "uuid": "aaddb98c-879b-472d-aa39-1a684ef7d179"\n}\n', '{\n  "uuid": "4bd7e2fd-1453-4433-aa9f-bc29d82f5b9d"\n}\n', '{\n  "uuid": "b02d65e8-2063-4060-96af-088ec497fc10"\n}\n', '{\n  "uuid": "e10e3dd2-83c5-4595-afe4-4145bce79193"\n}\n', '{\n  "uuid": "8cb62784-1b5d-4dcc-8342-02ad7d417ca9"\n}\n', '{\n  "uuid": "13ef1509-4f69-4426-ac42-cb29a2d0f094"\n}\n', '{\n  "uuid": "4d4571d5-69bb-4625-b246-b5eef50aa10d"\n}\n', '{\n  "uuid": "75e7a2ca-bfa8-43b9-b33a-f3f927453579"\n}\n', '{\n  "uuid": "0a8cc8ff-2039-4873-9e38-afad3e10d726"\n}\n', '{\n  "uuid": "189ae75b-4879-4897-9725-f9be17e49844"\n}\n', '{\n  "uuid": "ba482468-f45f-4060-a0c1-3ef31bb283c8"\n}\n', '{\n  "uuid": "3809f1c7-2f11-487d-bf96-8abf64e08298"\n}\n', '{\n  "uuid": "da5ea88b-974d-4238-9654-ac56c657c8b4"\n}\n', '{\n  "uuid": "edc3de79-7cf4-42a3-a5f4-b754136a6fd3"\n}\n', '{\n  "uuid": "6f5ecd91-537c-4009-8435-6c31ce035d36"\n}\n', '{\n  "uuid": "4a33b29d-78ba-468f-8f30-a01b3d9e2a87"\n}\n', '{\n  "uuid": "a5a2ef2d-d4a2-48e1-8335-f8c1309328c4"\n}\n', '{\n  "uuid": "3d1679da-afdd-4f04-9c16-0aaea4c53d0c"\n}\n', '{\n  "uuid": "c4025845-0d4c-4549-acb8-1a249b33e644"\n}\n']
time:  1.0535461902618408

---

即使使用curl，对于{1..100}的100个请求

时间，我也得到了0.111ms；卷曲http://httpbin.org/uuid &完成

这很奇怪。这是因为每个卷曲都被分解成不同的进程，但同样的事情在我的代码中不起作用-

time for uin{1..100}；卷曲http://httpbin.org/uuid &done&&ps aux | grep curl

IKR我刚才说的是，asyncio的行为应该与curl完全一样，我在我的机器上尝试了不同的方法，但也没有成功，然后我想uvicorn只是另一个事件循环，可能是问题所在，之后我正常运行它，这也花了很长的时间。而且我正在使用asyncio的这种模式，这对我来说非常可靠，我创建了一个你可能想检查一下的模式，你也可以尝试一下。使用基本url创建一个异步客户端，然后使用该客户端（相当于一个

请求

会话）对该url执行100次调用您可能希望在

任务

中创建一个会话，并将其传递给

main（）

。这将允许aiohttp通过重用TCP连接来提高效率。“这是对FastAPI的依赖。”-不是。这只是对

FastAPI[test]

的依赖，所以我删除了这个短语以避免混淆人们。

['{\n  "uuid": "a7713d07-ea5d-40d3-95b4-6673f3c50a8b"\n}\n', '{\n  "uuid": "c93f8b89-2c44-40fa-9e5f-736e22ad5f23"\n}\n', '{\n  "uuid": "cbb4ad76-7790-45ae-87f1-e425eddc8021"\n}\n', '{\n  "uuid": "4c1d81c0-ae7d-401a-99df-e98af3651335"\n}\n', '{\n  "uuid": "c5f70738-fbba-4cf9-8fdf-29f8b4eabe63"\n}\n', '{\n  "uuid": "d016b852-4312-4502-a336-a6a110237d1d"\n}\n', '{\n  "uuid": "22d8b00b-4266-4236-b5a3-ed5d7c5be416"\n}\n', '{\n  "uuid": "cd54fdbb-7de9-4df3-90cc-e6b108d5fdf8"\n}\n', '{\n  "uuid": "757f0a26-7896-4a04-bea2-60c66a38b05b"\n}\n', '{\n  "uuid": "72eb6584-21f4-449b-b6bd-d0f88666126f"\n}\n', '{\n  "uuid": "b3deadf5-5b79-491b-829c-0404c306cb68"\n}\n', '{\n  "uuid": "789e7422-493d-49d2-9585-e5ca34b7cf36"\n}\n', '{\n  "uuid": "48d29a82-ff7c-41f5-8af2-42784326a31f"\n}\n', '{\n  "uuid": "84b2d67c-331c-4037-b6e4-c299d93c1899"\n}\n', '{\n  "uuid": "386e79f9-073a-4f27-961c-7befcdf95cd4"\n}\n', '{\n  "uuid": "8dfdb5e4-dd69-4043-b174-48ec8505f36f"\n}\n', '{\n  "uuid": "633e634b-b107-42bb-a7d3-c6bbfff089a0"\n}\n', '{\n  "uuid": "962d665f-8663-4be7-a3c6-9426ba500bf4"\n}\n', '{\n  "uuid": "320fb858-a751-4c34-9cdb-ddd2f4e28efa"\n}\n', '{\n  "uuid": "46a75693-5255-4ac7-8d7a-54910b4d6f68"\n}\n', '{\n  "uuid": "5323734b-7ff9-455e-ba5a-66383e6b9a1f"\n}\n', '{\n  "uuid": "622a579f-35b6-4e4b-9dba-a8a69c2049c8"\n}\n', '{\n  "uuid": "593d5e82-cef3-4be0-99ab-e3034855d7a1"\n}\n', '{\n  "uuid": "80f139df-2a27-40c1-8329-e4faa035c45c"\n}\n', '{\n  "uuid": "a97e084c-4d30-4c7b-a96e-89ed00dcfe2a"\n}\n', '{\n  "uuid": "360d49eb-7222-4064-81c2-6eba2d43a9a5"\n}\n', '{\n  "uuid": "a81b6eab-a646-4e58-b986-96a90baa52aa"\n}\n', '{\n  "uuid": "0160337e-b400-41d6-ae89-aa46c5131f40"\n}\n', '{\n  "uuid": "e600722f-8c15-4959-948b-4c4e5296feb2"\n}\n', '{\n  "uuid": "f15403e4-3674-43b2-a0c9-649fd828ba7e"\n}\n', '{\n  "uuid": "36bf139c-cc18-45a8-bc55-e7f90ce290b5"\n}\n', '{\n  "uuid": "b2368a3c-d86b-4fcd-a0d3-bf7f8f657a83"\n}\n', '{\n  "uuid": 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