最近在接一个前后端分离的项目，后端使用的django-restframework，前端使用的Vue。后端跑起来后，发现前端在访问后端API时出了了跨域的问题。
类似如下报错：
关于跨域问题，之前这篇文章也提到过一、前后端交互之Ajax及跨域问题，当时里面是使用的jsonp方式，但是jsonp只支持GET方法，不能全面支持跨域。
这里主要学习一下通过后端解决跨域问题的方法，其实前端也有解决跨域的方法，后面学习到了再写一个文章记录。
django后端解决跨域方式一Middleware
中间介实现跨域过程
1、新建中间介包
#mkidr middleware
#touch middleware/__init.py__
#vim middleware/crossdomainxhr.py
from django import http try:
from django.conf import settings
XS_SHARING_ALLOWED_ORIGINS = settings.XS_SHARING_ALLOWED_ORIGINS
XS_SHARING_ALLOWED_METHODS = settings.XS_SHARING_ALLOWED_METHODS
XS_SHARING_ALLOWED_HEADERS = settings.XS_SHARING_ALLOWED_HEADERS
XS_SHARING_ALLOWED_CREDENTIALS = settings.XS_SHARING_ALLOWED_CREDENTIALS
except AttributeError:
XS_SHARING_ALLOWED_ORIGINS = '*'
#XS_SHARING_ALLOWED_METHODS = ['POST', 'GET', 'OPTIONS', 'PUT', 'DELETE']
XS_SHARING_ALLOWED_METHODS = ['POST', 'GET']
XS_SHARING_ALLOWED_HEADERS = ['Content-Type', '*']
XS_SHARING_ALLOWED_CREDENTIALS = 'true' class XsSharing(object):
"""
This middleware allows cross-domain XHR using the html5 postMessage API. Access-Control-Allow-Origin: http://foo.example
Access-Control-Allow-Methods: POST, GET, OPTIONS, PUT, DELETE Based off https://gist.github.com/426829
"""
def process_request(self, request):
if 'HTTP_ACCESS_CONTROL_REQUEST_METHOD' in request.META:
response = http.HttpResponse()
response['Access-Control-Allow-Origin'] = XS_SHARING_ALLOWED_ORIGINS
response['Access-Control-Allow-Methods'] = ",".join( XS_SHARING_ALLOWED_METHODS )
response['Access-Control-Allow-Headers'] = ",".join( XS_SHARING_ALLOWED_HEADERS )
response['Access-Control-Allow-Credentials'] = XS_SHARING_ALLOWED_CREDENTIALS
return response return None def process_response(self, request, response):
response['Access-Control-Allow-Origin'] = XS_SHARING_ALLOWED_ORIGINS
response['Access-Control-Allow-Methods'] = ",".join( XS_SHARING_ALLOWED_METHODS )
response['Access-Control-Allow-Headers'] = ",".join( XS_SHARING_ALLOWED_HEADERS )
response['Access-Control-Allow-Credentials'] = XS_SHARING_ALLOWED_CREDENTIALS return response
settings文件配置：
在中间介新增配置
'finance.middleware.crossdomainxhr.XsSharing',
跨域配置：
我这里前端使用的是源是http://127.0.0.1:8081
# crossdomain
#XS_SHARING_ALLOWED_ORIGINS ='*'
XS_SHARING_ALLOWED_ORIGINS = 'http://127.0.0.1:8081'
XS_SHARING_ALLOWED_METHODS = ['POST', 'GET']
XS_SHARING_ALLOWED_HEADERS = ['Content-Type', '*']
XS_SHARING_ALLOWED_CREDENTIALS = 'true'
django后端解决跨域方式二django-cors-headers
通过第三方包方式：https://github.com/ottoyiu/django-cors-headers
注意：既然有第三方包，name为什么还要用第一种方式，自己写呢？原因是第三方包对Django的版本有要求：
有些Django版本比较老的话 就只能用第一种方式咯。
具体实现如下：
1、安装django-cors-headers
pip install django-cors-headers
2、配置settings.py文件
a.在INSTALLED_APPS里添加“corsheaders”
INSTALLED_APPS = [
...
'corsheaders'，
...
]
b.在MIDDLEWARE_CLASSES添加配置：
MIDDLEWARE_CLASSES = (
...
'corsheaders.middleware.CorsMiddleware',
'django.middleware.common.CommonMiddleware',
...
)
c.在sitting.py底部添加
CORS_ALLOW_CREDENTIALS = True
CORS_ORIGIN_ALLOW_ALL = True
CORS_ORIGIN_WHITELIST = () CORS_ALLOW_METHODS = (
'DELETE',
'GET',
'OPTIONS',
'PATCH',
'POST',
'PUT',
'VIEW',
) CORS_ALLOW_HEADERS = (
'accept',
'accept-encoding',
'authorization',
'content-type',
'dnt',
'origin',
'user-agent',
'x-csrftoken',
'x-requested-with',
)