Forcing response charset in CherryPy

Question

I want to specify the HTTP response charset by modifying the Content-Type header. However, it doesn't work.

Here is a short example:

#coding=utf-8
import cherrypy

class Website:
    @cherrypy.expose()
    def index(self):
        cherrypy.response.headers['Content-Type']='text/plain; charset=gbk'
        return '。。。'.encode('gbk')

cherrypy.quickstart(Website(),'/',{
    '/': {
        'tools.response_headers.on':True,
    }
})

And when I visit that page, the Content-Type is changed mysteriously to text/plain;charset=utf-8, causing mojibake in the browser.

C:\Users\Administrator>ncat 127.0.0.1 8080 -C
GET / HTTP/1.1
Host: 127.0.0.1:8080

HTTP/1.1 200 OK
Server: CherryPy/7.1.0
Content-Length: 6
Content-Type: text/plain;charset=utf-8
Date: Mon, 22 Aug 2016 01:08:13 GMT

。。。^C

It seems that CherryPy detect content encoding and override the charset automatically. If so, how can I disable this feature?

score 0 · Accepted Answer · answered Aug 22 '16 at 02:49

0

All right. Solved this problem by tampering cherrypy.response.header_list directly.

#coding=utf-8
import cherrypy

def set_content_type():
    header=(b'Content-Type',cherrypy.response._content_type.encode())

    for ind,(key,_) in enumerate(cherrypy.response.header_list):
        if key.lower()==b'content-type':
            cherrypy.response.header_list[ind]=header
            break
    else:
        cherrypy.response.header_list.append(header)

cherrypy.tools.set_content_type=cherrypy.Tool('on_end_resource',set_content_type)

class Website:
    @cherrypy.expose()
    @cherrypy.tools.set_content_type()
    def index(self):
        cherrypy.response._content_type='text/plain; charset=gbk'
        return '。。。'.encode('gbk')

cherrypy.quickstart(Website(),'/')

answered Aug 22 '16 at 02:49

xmcp

3,347
2
23
36

You should try setting `tools.encode.encoding` and `tools.decode.encoding` http://docs.cherrypy.org/en/latest/config.html#environments – webknjaz -- Слава Україні Aug 22 '16 at 13:59
well, the website i'm working into is a file-sharing server, which means the encoding varies from file to file. so i can't hard-code the encoding into cherrypy config. – xmcp Aug 22 '16 at 14:04
Cherrypy config may be overridden on class or handler basis. It doesn't have to be global. – webknjaz -- Слава Україні Aug 22 '16 at 14:44
the encoding varies according to the request parameters. for example, `/download?id=1` might be `UTF-8` encoded and `/download?id=2` might be something else. – xmcp Aug 22 '16 at 14:47
1

http://stackoverflow.com/a/38665815/595220 JFYI you are able to modify headers without additional hooks/tools – webknjaz -- Слава Україні Aug 22 '16 at 14:49
i know, but cherrypy will modify my modified `Content-Type` header back if I change `cherrypy.response.headers` directly in the handler, as my question says. – xmcp Aug 22 '16 at 14:53

score 0 · Answer 2 · answered Aug 10 '20 at 12:07

I had success to set the content-type-charset by setting/manipulate the request header attribute "Accept-Charset".

cherrypy.request.headers["Accept-Charset"] = "ISO-8859-1"
cherrypy.response.headers["Content-Type"] = "text/xml"

The result:

>curl -I https://127.0.0.1/url?param=value

HTTP/1.1 200 OK
Content-Type: text/xml;charset=ISO-8859-1
Server: CherryPy/18.6.0
Date: Mon, 10 Aug 2020 11:54:49 GMT
Content-Length: 288
Set-Cookie: session_id=d28fa46a1a3d901d9502038255ce869b21add5cc; expires=Mon, 10 Aug 2020 12:54:49 GMT; Max-Age=3600; Path=/

Forcing response charset in CherryPy

2 Answers2