Python uses web.py to develop httpserver to address cross-domain issues with post requests

When using web.py to do HTTP server development, encountered postman can request to the data normally, but the browser cannot request to the data, check the reason after discovery is a cross-domain request problem.

Cross-domain requests, that is, in the browser window, and a server through a "protocol + domain name + port number" Set up a session, to use any of these three attributes of a different source to submit the request, then the browser thinks you are cross-domain, violating the browser's homologous policy. There are three types of cross-domain access restrictions in the response header for cross-domain request specifications:

Access-control-allow-origin: Restrict the sources that allow cross-domain access, such as http://192.168.10.12:8080, note that this only supports * (for all source) numbers or a source, does not support multiple sources, and if you want to implement multiple sources, You can wrap a collection for each request in the collection to determine whether it exists, if it exists, put it in the response header;

Access-control-allow-methods: Limit the types of HTTP methods that allow cross-domain access, multiple comma-separated, such as: POST, GET, Options,put, DELETE

Access-control-allow-headers: Restrict the HTTP headers that allow cross-domain access, including the headers set here, to allow cross-domain access, such as: Content-type, Content-length, accept-encoding, X-csrf-token, Authorization

web.py using Web.header (), you can define the header.

The complete Httpserver code is as follows "ap-httpserver.py":

[Python]View PlainCopy

2. #!/usr/bin/env python
4. # Encoding:utf-8
6. Import Redis
8. Import Web
10. Import JSON
12. Import string
14. From time import time
18. URLs = (
20. ' /qlljx/realtimedata ', ' RealTimeData '
22. )
24. App = Web.application (URLs, globals ())
28. Def getresult ():
30. R = Redis. Redis (host=' 127.0.0.1 ', port=6379)
32. Result_list = []
34. Regionlist = R.hgetall (' regionlist ')
36. timestamp = R.hget (' ZHONGGUO_BGP ', ' timestamp ')
38. For region in regionlist:
40. Value = {' MIP ': Str (regionlist[region]), ' region ': region, \
42. ' Inpps ': Int (r.hget (region, ' Inpps ')), ' Outpps ': Int. (R.hget (Region, ' Outpps ')), \
44. ' inbps ': Int (r.hget (region, ' inbps ')), ' outbps ': Int. (R.hget (Region, ' outbps ')), \
46. ' pktpct ': String.atof (r.hget (Region, ' pktpct ') "), ' bytpct ': String.atof (r.hget (Region, ' bytpct ')}
48. Result_list.append (value)
52. result = {' timestamp ': timestamp, ' result ': result_list}
54. return Json.dumps (Result)
58. Class RealTimeData:
60. def POST (self):
62. data = Web.data ()
64. Request_type = str (json.loads (data) [' type '])
66. if Request_type = = ' getrealtimedata ':
68. result = GetResult ()
70. Web.header ("Access-control-allow-origin", "*")
72. #web. Header ("Access-control-allow-methods", "POST, GET, OPTIONS, PUT, DELETE")
74. #web. Header ("Access-control-allow-headers", "Accept, Content-type, content-length, \
76. # accept-encoding, X-csrf-token, Authorization ")
78. return result
82. if __name__ = = "__main__":
84. App.run ()

Only the "Access-control-allow-origin" limit is used, allowing requests from all sources. Start Httpserver:

1. [Email protected] python]#/ap-httpserver.py 1216

Using the browser to request data is OK.

Python uses web.py to develop httpserver to address cross-domain issues with post requests