Python、Flask：方法不允许，请求的方法不允许 URL

Question

So I am trying to launch a node to run a distributed ledger but every time I want to run it I get this message

172.16.1.109 - - [30/Nov/2021 14:38:45] "GET /transactions/new HTTP/1.1" 405 - See here for the error

Here is some of my code:

from uuid import uuid4
from flask import Flask as Flask
from flask import send_file as send_file
from flask import request as request
from flask import jsonify as jsonify
import networkx as nx
import matplotlib.pyplot as plt
import os
import sys
# custom classes
from ledger.node import node
from ledger.util import Util
app = Flask(__name__)
@app.route('/node/register_neighbours', methods=['GET', 'POST'])
def register_new_node():
    print("register_new node")
    response = node.register_neighbours(request.get_json())
    return jsonify(response), 201
@app.route('/transactions/new', methods=['GET', 'POST'])
def make_transaction():
    request_params = request.get_json(force=True)
    response = node.ledger.make_transaction(request.form.get('sending_address'),
                                            request.form.get('receiving_address'),
                                            request.form.get('value'))
    return jsonify(response), 201
@app.route('/wallet/balance', methods=['GET', 'POST'])
def wallet_balance():
    address = request.form.get('address')
    if address in node.wallet.getWalletAddresses():
        return "[+] Wallet balance for address [%s] is: %s " % (address, node.wallet.getbalance(address))
    else:
        return "[-] This node's wallet has no such address: %s" % address
@app.route('/wallet/addresses', methods=['GET', 'POST'])
def wallet_addresses():
    return "[+] Wallets addresses of this node: " + str(node.wallet.getWalletAddresses().keys())
@app.route('/dag', methods=['GET', 'POST'])
def show_DAG():
    serializable_format = node.getTangleAsJSONdict()
    node.writeTangleToJSONfile()
    return jsonify(serializable_format), 201
# return jsonify(node.tangle.DAG), 201
    # problem with the original code was that, DAG dictionary has Transaction Objects as values,
    # and those are not serializable as JSON objects.
    # return jsonify(node.DAG), 201
@app.route('/dag/png', methods=['GET', 'POST'])
def get_DAG_as_png():
    serializable_format = node.getTangleAsJSONdict()
    node.writeTangleToJSONfile()

Answer 1

You've specified that the only acceptable method for that endpoint is POST :

@app.route('/transactions/new', methods=['POST'])

You can edit this to include GET as an item in the array, however this will not work, as it's expecting form data to be supplied.

As you're attempting to access from a browser, you'll always be using a GET request and wont be able to supply the form data. I recommend a tool such as Postman or Insomnia to generate HTTP requests when testing.

With a tool such as these, you can add the data that needs to be supplied, in your case the fields sending_address , recieving_address and value .

In a web app, you'll need to include a form that has those fields for it work.