400 Bad Request: The browser (or proxy) sent a request that this server could not understand.

最新推荐文章于 2025-03-20 10:42:24 发布

卡冈都亚

最新推荐文章于 2025-03-20 10:42:24 发布

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本文链接：https://blog.youkuaiyun.com/qq_34919833/article/details/104565753

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问题：from flask_restful reqparse 自定义的help内容无法显示
代码如下：

from flask_restful import reqparse
class EquipmentStaticView(views.MethodView):

    def ret_init(self):
        return {
            "message": '',
            "status": '',
            "count": 0,
            "data": []
        }
        
    @swag_from('./api_doc/demo.yml')
    def post(self, *args, **kwargs):
        r = self.ret_init()
        parser = reqparse.RequestParser(bundle_errors=True)
        add = parser.add_argument
        add('eqmt_no', type=str,required=True, help="emp_no is requied")
        add('eqmt_name', type=str)
        add('spce', type=str)
        add('counts', type=int,help='must be an int')
        add('manufacturer', type=str)
        add('supplier', type=str)
        add('maintain_dept', type=str)
        add('line', type=str)
        add('sys_tp', type=str)
        add('major', type=str)
        add('measure_unit', type=str)
        add('use_date', type=lambda x: datetime.datetime.strptime(x, '%Y-%m-%d'),help='must be format like:2020-01-01')
        add('install_addr', type=str)
        add('dept', type=str)
        args = parser.parse_args()
      
        logger.info(args)
        try:
            x = EquipmentStatic(**args)
            session.add(x)
            session.flush()
            session.commit()
            schema = EquipmentStaticSchema()
            result = schema.dump(x)
            r["data"].append(result)
            r["count"] = 1
            r["status"] = 201
            r["message"] = "创建成功"
        except Exception as e:
            session.rollback()
            r["message"] = e.__repr__()
            r["status"] = 400
            return jsonify(r), 400

        return jsonify(r), 201

预期是在当post时前端传来的参数错误里返回 add(‘eqmt_no’, type=str,required=True, help=“emp_no is requied”) 这里 help中定议的提示信息，
但是上面代码返回的并不如预期，而是返回：400 Bad Request: The browser (or proxy) sent a request that this server could not understand.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>400 Bad Request</title>
<h1>Bad Request</h1>
<p>The browser (or proxy) sent a request that this server could not understand.</p>

经过一烦查看源码后。终于找到问题目的所在了。
先从函数parser.add_argument一层层的往下找

args = parser.parse_args()
-- 以下是 
    def parse_args(self, req=None, strict=False, http_error_code=400):
        ...省略一些源码... 看这里  当有错误时，是调用 flask_restful.abort
        if errors:
            flask_restful.abort(http_error_code, message=errors)

        if strict and req.unparsed_arguments:
            raise exceptions.BadRequest('Unknown arguments: %s'
                                        % ', '.join(req.unparsed_arguments.keys()))

        return namespace

接下来看一下 flask_restful.abort

def abort(http_status_code, **kwargs):
    """Raise a HTTPException for the given http_status_code. Attach any keyword
    arguments to the exception for later processing.
    """
    #noinspection PyUnresolvedReferences
    try:
        original_flask_abort(http_status_code)
    except HTTPException as e:
        if len(kwargs):
            e.data = kwargs
        raise

从代码来看，abort是将错误存到了 exception 的data中了。并将异常抛出，所以解决办法就是，处理这个异常，并将异常中的data返给前端。

        try:
            args = parser.parse_args()
        except Exception as e:
            logger.info(e)
            r.update(e.data)
            return jsonify(r),400

看下效果吧：

{
  "count": 0,
  "data": [],
  "message": {
    "eqmt_no": "emp_no is requied"
  },
  "status": ""
}