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Adding and replacing response headers

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Adding and replacing response headers

>>> @replaceheader([(r'.*\.html', [('Content-type', 'text/html')])])
... def app(environ, start_response):
... start_response('200 OK',
... [('Content-type', 'text/plain')])
... return ['Hello, world!']
>>> import webtest
>>> app = webtest.TestApp(app)
>>> res = app.get('/a.txt')
>>> res.content_type
'text/plain'
>>> res = app.get('/a.html')
>>> res.content_type
'text/html'
>>> def xrds(environ):
... return [('X-XRDS', environ['wsgi.url_scheme'] + '://' +
environ['SERVER_NAME'] + '/svc.xrds')]
...
>>> def predicate(environ):
... return environ.get('HTTP_ACCEPT', '').find('application/xrds+xml') != -
1
...
>>> @addheader([(predicate, xrds)])
... def app(environ, start_response):
... start_response('200 OK',
... [('Content-type', 'text/plain')])
... return ['Hello, world!']
>>> app = webtest.TestApp(app)
>>> res = app.get('/')
>>> 'X-XRDS' in res.headers
False
>>> res = app.get('/', headers={'Accept':'application/xrds+xml'})
>>> res.headers['X-XRDS']
'http://localhost/svc.xrds'

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