当内容类型没有在http中发送时会出现什么问题？

Question

What issues are there when content-type not sent in an httpresponse header? Specifically what happens to JSON types like the one below if content_type is omitted?

class JSONResponse(HttpResponse):
"""
An HttpResponse that renders its content into JSON.
"""
def __init__(self, data, **kwargs):
    content = JSONRenderer().render(data)
    kwargs['content_type'] = 'application/json'
    super(JSONResponse, self).__init__(content, **kwargs)

Answer 1

According to HTTP spec content-type should be passed as one of the headers, there is no "default value". If the client does not implement it - it's up to the server's implementation to decide what to return in the response. See last section of 7.2.1