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[#]: author: "Moshe Zadka https://opensource.com/users/moshez"
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[#]: collector: "lujun9972"
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[#]: translator: "geekpi"
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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[#]: reviewer: "wxy"
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[#]: publisher: "wxy"
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[#]: url: "https://linux.cn/article-14353-1.html"
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如何使用 httpx,一个 Python web 客户端
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httpx:一个 Python Web 客户端
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======
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Python 的 httpx 包是一个用于 HTTP 交互的一个优秀且灵活的模块。
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![Digital creative of a browser on the internet][1]
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Python 的 `httpx` 包是一个复杂的 web 客户端。当你安装它后,你就可以用它来从网站上获取数据。像往常一样,安装它的最简单方法是使用 `pip` 工具:
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> Python 的 httpx 包是一个用于 HTTP 交互的一个优秀且灵活的模块。
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![](https://img.linux.net.cn/data/attachment/album/202203/13/102042hmtif0i7g3fg0ir0.jpg)
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Python 的 `httpx` 包是一个复杂的 Web 客户端。当你安装它后,你就可以用它来从网站上获取数据。像往常一样,安装它的最简单方法是使用 `pip` 工具:
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```
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`$ python -m pip install httpx --user`
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$ python -m pip install httpx --user
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```
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要使用它,把它导入到 Python 脚本中,然后使用 `.get` 函数从一个 web 地址获取数据:
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```
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import httpx
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result = httpx.get("<https://httpbin.org/get?hello=world>")
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result = httpx.get("https://httpbin.org/get?hello=world")
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result.json()["args"]
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```
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下面是这个简单脚本的输出:
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```
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` {'hello': 'world'}`
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{'hello': 'world'}
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```
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### HTTP 响应
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@ -44,97 +40,71 @@ result.json()["args"]
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试试这个代码:
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```
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result = httpx.get("<https://httpbin.org/status/404>")
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result = httpx.get("https://httpbin.org/status/404")
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result
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```
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结果是:
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```
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` <Response [404 NOT FOUND]>`
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<Response [404 NOT FOUND]>
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```
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可以明确地返回一个响应。添加这个异常处理:
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```
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try:
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result.raise_for_status()
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except Exception as exc:
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print("woops", exc)
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```
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下面是结果:
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```
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woops Client error '404 NOT FOUND' for url '<https://httpbin.org/status/404>'
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For more information check: <https://httpstatuses.com/404>
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woops Client error '404 NOT FOUND' for url 'https://httpbin.org/status/404'
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For more information check: https://httpstatuses.com/404
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```
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### 自定义客户端
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除了最简单的脚本之外,使用一个自定义的客户端是值得的。除了不错的性能改进,比如连接池,这是一个配置客户端的好地方。
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除了最简单的脚本之外,使用一个自定义的客户端是有意义的。除了不错的性能改进,比如连接池,这也是一个配置客户端的好地方。
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例如, 你可以设置一个自定义的基本 URL:
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```
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client = httpx.Client(base_url="<https://httpbin.org>")
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client = httpx.Client(base_url="https://httpbin.org")
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result = client.get("/get?source=custom-client")
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result.json()["args"]
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```
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输出示例:
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```
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` {'source': 'custom-client'}`
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{'source': 'custom-client'}
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```
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这对一个典型的场景很有用,你用客户端与一个特定的服务器对话。例如,使用 `base_url` 和 `auth`,你可以为认证的客户端建立一个漂亮的抽象:
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这对用客户端与一个特定的服务器对话的典型场景很有用。例如,使用 `base_url` 和 `auth`,你可以为认证的客户端建立一个漂亮的抽象:
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```
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client = httpx.Client(
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base_url="<https://httpbin.org>",
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base_url="https://httpbin.org",
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auth=("good_person", "secret_password"),
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)
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result = client.get("/basic-auth/good_person/secret_password")
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result.json()
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```
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输出:
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```
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` {'authenticated': True, 'user': 'good_person'}`
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{'authenticated': True, 'user': 'good_person'}
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```
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你可以用它来做一件更好的事情,就是在顶层的 “main” 函数中构建客户端,然后把它传递给其他函数。这可以让其他函数使用客户端,并让它们与连接到本地 WSGI 应用的客户端进行单元测试。
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你可以用它来做一件更棒的事情,就是在顶层的 “主” 函数中构建客户端,然后把它传递给其他函数。这可以让其他函数使用客户端,并让它们与连接到本地 WSGI 应用的客户端进行单元测试。
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```
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def get_user_name(client):
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result = client.get("/basic-auth/good_person/secret_password")
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return result.json()["user"]
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@ -145,16 +115,14 @@ get_user_name(client)
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def application(environ, start_response):
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start_response('200 OK', [('Content-Type', 'application/json')])
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return [b'{"user": "pretty_good_person"}']
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fake_client = httpx.Client(app=application, base_url="<https://fake-server>")
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fake_client = httpx.Client(app=application, base_url="https://fake-server")
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get_user_name(fake_client)
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```
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输出:
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```
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` 'pretty_good_person'`
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'pretty_good_person'
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```
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### 尝试 httpx
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@ -168,7 +136,7 @@ via: https://opensource.com/article/22/3/python-httpx
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作者:[Moshe Zadka][a]
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选题:[lujun9972][b]
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译者:[geekpi](https://github.com/geekpi)
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校对:[校对者ID](https://github.com/校对者ID)
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校对:[wxy](https://github.com/wxy)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译,[Linux中国](https://linux.cn/) 荣誉推出
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