human
Solve the following python programming problem given the following code:
@ pytest.fixture (scope = 'module') 
def url_prefix(request) : 
    host = 'httpbin.org' 
    port = 80 
    requests_intercept.install () 
    add_wsgi_intercept (request, port, (lambda : httpbin.app)) 
    @ request.addfinalizer 
    def fin() : 
        requests_intercept.uninstall () 
return 'http://{0}:{1}/'.format (host, port) 

    
    

    Fix the buggy line: add_wsgi_intercept (request, port, (lambda : httpbin.app))
assistant
#Here is Python code to fix the buggy line: add_wsgi_intercept (request, port, (lambda : httpbin.

add_wsgi_intercept (host, port, (lambda : httpbin.app))