PUT 方法的烧瓶应用程序错误："The method is not allowed for the requested URL."

flask application error for PUT method: "The method is not allowed for the requested URL."

我正在使用 Python flask 构建 REST API 应用程序。我在以 PUT 和 DELETE 方法发送请求时收到 >405 Method Not Allowed< 错误。使用 GET 和 POST 时获得正确的结果。我在没有解决方案的情况下盘旋。已经提供的大多数解决方案要么是因为 HTML 模板中缺少方法，要么是函数 argument.But 在我的例子中，我正在使用 API 使用 curl 调用端点。

from flask import Flask, jsonify, request

products = [
    {'id': 0, 'name': 'Product 0'},
    {'id': 1, 'name': 'Product 1'}
]

app = Flask(__name__)


# curl -v http://localhost:8080/products
@app.route('/products')
def index():
    return jsonify(products)


# curl -v http://localhost:8080/product/0
@app.route('/product/<int:id>')
def get_product_id(id):
    product_list = [product for product in products if product['id'] == id]
    if not product_list:
        return f'Product with id {id} not found!', 404
    return jsonify(product_list[0])


# curl
# --header "Content-Type: application/json"
# --request POST
# --data '{"name": "Product 3"}' -v http://localhost:8080/product/
@app.route('/product', methods=['POST'])
def add_product():
    # Retrieve the product from request body
    data = request.json

    # Generate an ID for the post
    new_id = max([product['id'] for product in products]) + 1

    # Create new product
    new_product = {
        'id': new_id,
        'name': data['name']
    }
    # add new product to the array
    products.append(new_product)

    return jsonify(new_product)


# curl --header "Content-Type: application/json"
# --request PUT
# --data '{"name": "Updated Product 2"}'
# -v http://localhost:8080/product/<int:id>

@app.route('/product/<int>:id', methods=['PUT'])
def update_product(id):
    change_data = request.json

    # Find product if available
    for product in products:
        if product['id'] == id:
            product['name'] = change_data['name']
            return jsonify(product), 200
    return f'Product with id {id} not found', 404

# curl --request DELETE -v http://localhost:8080/product/2
@app.route('/product/<int>:id', methods=['DELETE'])
def delete_product(id):
    for product in products:
        if product['id'] == id:
            products.remove(product)
            return f'Product with id {id} removed', 200
    return f'Product with id {id} not found', 404


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8080, debug=True)

错误：

$ curl -v http://localhost:8080/products

* Connected to localhost (127.0.0.1) port 8080 (#0)
> GET /products HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.64.1
> Accept: */*
> 
* HTTP 1.0, assume close after body
< HTTP/1.0 200 OK
< Content-Type: application/json
< Content-Length: 146
< Server: Werkzeug/2.0.1 Python/3.9.5
< Date: Fri, 13 Aug 2021 17:14:05 GMT
< 
[
  {
    "id": 0, 
    "name": "Product 0"
  }, 
  {
    "id": 1, 
    "name": "Product 1"
  }, 
  {
    "id": 2, 
    "name": "Product 2"
  }
]
* Closing connection 0


$ curl --header "Content-Type: application/json" --request PUT --data '{"name": "Updated Product 2"}' -v http://localhost:8080/product/2

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>405 Method Not Allowed</title>
<h1>Method Not Allowed</h1>
<p>The method is not allowed for the requested URL.</p>
* Closing connection 0

您的代码中有错字。将 :id 更改为 。