我已经构建了一个flask应用程序，但post请求不起作用
我已经构建了一个flask应用程序，但post请求不起作用
提问于 2020-07-02 09:07:33
我已经使用flask和sqlalchemy设置了一个数据库和一个应用程序，get请求工作正常，但post请求根本不工作，请在这里支持我，如果你可以，下面你会有代码，这只是我的项目的一小部分，get请求工作良好，但post否。
数据库设置
from sqlalchemy import Column, ForeignKey, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship, sessionmaker
from sqlalchemy import create_engine
from passlib.apps import custom_app_context as pwd_context
import random, string
from itsdangerous import(TimedJSONWebSignatureSerializer as Serializer, BadSignature, SignatureExpired)
Base = declarative_base()
class Relation(Base):
__tablename__ = 'relation'
id = Column(Integer, primary_key=True)
base_user_first = Column(String(250), nullable=False)
base_user_second = Column(String(250), nullable=False)
relation = Column(String(250), nullable=False)
reverse_relation = Column(String(250), nullable=False)
@property
def serialize(self):
return {
'base_user_first': self.base_user_first,
'id': self.id,
'base_user_second': self.base_user_second,
'relation': self.relation,
'reverse_relation': self.reverse_relation,
}
# creating the DB.
engine = create_engine('sqlite:///myneighbour.db')
Base.metadata.create_all(engine)应用程序代码
from database_setup import Base, Relation
from flask import Flask, jsonify, request, url_for, abort, g
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship, sessionmaker
from sqlalchemy import create_engine
from flask_httpauth import HTTPBasicAuth
from flask import session as login_session
import random
import string
from oauth2client.client import flow_from_clientsecrets
from oauth2client.client import FlowExchangeError
import httplib2
import json
from flask import make_response
import requests
auth = HTTPBasicAuth()
engine = create_engine('sqlite:///myneighbour.db')
Base.metadata.bind = engine
DBSession = sessionmaker(bind=engine)
session = DBSession()
app = Flask(__name__)
@app.route('/relation/<int:relation_id>/JSON')
def relationJSON(relation_id):
relation = session.query(Relation).filter_by(id=relation_id).one()
items = session.query(Relation).filter_by(
relation_id=relation_id).all()
return jsonify(Relation=[i.serialize for i in items])
# view all the relations
@app.route('/relation/JSON')
def relationsJSON():
relations = session.query(Relation).all()
return jsonify(relations=[r.serialize for r in relations])
# Create a new Relation
@app.route('/relation/new/', methods=['GET', 'POST'])
def newRelation():
# if 'username' not in login_session:
# return 405
if request.method == 'POST':
newRelation = Relation(
base_user_first=request.form['base_user_first'],
base_user_second=request.form['base_user_second'],
relation=request.form['relation'],
reverse_relation=request.form['reverse_relation'])
session.add(newRelation)
#flash('New Facility %s Successfully Created' % newFacility.name)
session.commit()
return jsonify (newRelation)
# Edit a Relation
@app.route('/relation/<int:relation_id>/edit/', methods=['GET', 'POST'])
def editRelation(relation_id):
editedRelation = session.query(
Relation).filter_by(id=relation_id).one()
# if 'username' not in login_session:
# return 405
# if editedFacility.user_id != login_session['user_id']:
# return "<script>function myFunction() {alert('You are not authorized \
# to edit this restaurant. Please create your own restaurant in order to\
# edit.');}</script><body onload='myFunction()'>"
if request.method == 'POST':
if request.form['base_user_first']:
editedRelation.base_user_first = request.form['base_user_first']
if request.form['base_user_second']:
editedRelation.base_user_second = request.form['base_user_second']
if request.form['relation']:
editedRelation.relation = request.form['relation']
if request.form['reverse_relation']:
editedRelation.reverse_relation = request.form['reverse_relation']
#flash('Restaurant Successfully Edited %s' % editedRestaurant.name)
return jsonify(editedRelation)
# else:
# return render_template(
# 'editRestaurant.html', restaurant=editedRestaurant
# )
# Delete a relation
@app.route('/relation/<int:relation_id>/delete/', methods=['GET', 'POST'])
def deleteRelation(relation_id):
relationToDelete = session.query(
Relation).filter_by(id=relation_id).one()
# if 'username' not in login_session:
# return 405
# if facilityToDelete.user_id != login_session['user_id']:
# return "<script>function myFunction() {alert('You are not authorized \
# to delete this restaurant. Please create your own restaurant in order \
# to delete.');}</script><body onload='myFunction()'>"
if request.method == 'POST':
session.delete(relationToDelete)
#flash('%s Successfully Deleted' % restaurantToDelete.name)
session.commit()
return ("the relation has been deleted")
if __name__ == '__main__':
app.debug = True
#app.config['SECRET_KEY'] = ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(32))
app.run(host="0.0.0.0", port=5000, debug=True)下面是我使用/relation.new端点通过postman发出post请求时收到的信息
<!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>回答 2
Stack Overflow用户
发布于 2020-07-02 12:05:45
将所有出现的request.form['base_user_first']等替换为request.form.get('base_user_first')
Stack Overflow用户
发布于 2020-07-02 13:22:04
您收到来自服务器的Bad Request错误。这意味着您的前端(HTML表单)没有向服务器发送预期的参数。例如，如果您的服务器希望通过post从客户端获得字段数据，如下所示：
@app.route('/user', methods=["GET", "POST"])
def userdata():
name = request.form['name']
email = request.form['email']
....你的前端会发送类似这样的东西：
fetch('/users', {
method: 'POST',
body: {
nam: "Typo in name",
email: "email@somethig.com"
},
})服务器需要name，但是前端代码发送了**nam**，这将生成Bad Request(400)错误。底线是，确保来自前端的所有请求数据都与服务器期望的数据相匹配。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/62687466
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