如何在 Flask 中获取 POSTed JSON? [英] How to get POSTed JSON in Flask?

问题描述

我正在尝试使用 Flask 构建一个简单的 API，我现在想在其中读取一些 POSTed JSON.我使用 Postman Chrome 扩展程序执行 POST，我 POST 的 JSON 只是 {"text":"lalala"}.我尝试使用以下方法读取 JSON:

I'm trying to build a simple API using Flask, in which I now want to read some POSTed JSON. I do the POST with the Postman Chrome extension, and the JSON I POST is simply {"text":"lalala"}. I try to read the JSON using the following method:

@app.route('/api/add_message/<uuid>', methods=['GET', 'POST'])
def add_message(uuid):
    content = request.json
    print content
    return uuid

在浏览器上它正确返回了我放在 GET 中的 UUID，但在控制台上，它只打印出 None(我希望它打印出 {"text":"lalala"}.有谁知道我如何从 Flask 方法中获取发布的 JSON?

On the browser it correctly returns the UUID I put in the GET, but on the console, it just prints out None (where I expect it to print out the {"text":"lalala"}. Does anybody know how I can get the posted JSON from within the Flask method?

推荐答案

首先，.json 属性是委托给 request.get_json() 方法，它记录了您看到 None 的原因这里.

First of all, the .json attribute is a property that delegates to the request.get_json() method, which documents why you see None here.

您需要将 .json 属性和 .get_json() 方法的请求内容类型设置为 application/json(没有参数)，否则将产生 None .请参阅 Flask Request 文档:

You need to set the request content type to application/json for the .json property and .get_json() method (with no arguments) to work as either will produce None otherwise. See the Flask Request documentation:

如果 mimetype 指示 JSON(application/json，请参阅 is_json())，否则为None.

This will contain the parsed JSON data if the mimetype indicates JSON (application/json, see is_json()), otherwise it will be None.

您可以通过将 force=True 关键字参数传递给 request.get_json() 来告诉 request.get_json() 跳过内容类型要求.

You can tell request.get_json() to skip the content type requirement by passing it the force=True keyword argument.

请注意，如果此时出现 异常(可能导致 400 Bad Request 响应)，则您的 JSON 数据 无效.它在某种程度上是畸形的；您可能需要使用 JSON 验证器进行检查.

Note that if an exception is raised at this point (possibly resulting in a 400 Bad Request response), your JSON data is invalid. It is in some way malformed; you may want to check it with a JSON validator.

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