[英]Content-Type header not getting set in Tornado
I have the following base class: 我有以下基类:
class CorsHandler(tornado.web.RequestHandler):
def set_default_headers(self):
super(CorsHandler, self).set_default_headers()
self.set_header('Access-Control-Allow-Origin', self.request.headers.get('Origin', '*'))
self.set_header('Access-Control-Allow-Methods', 'GET, PUT, POST, DELETE, OPTIONS')
self.set_header('Access-Control-Allow-Credentials', 'true')
self.set_header('Access-Control-Allow-Headers', ','.join(
self.request.headers.get('Access-Control-Request-Headers', '').split(',') +
['Content-Type']
))
self.set_header('Content-Type', 'application/json')
def options(self, *args, **kwargs):
pass
And the following handler: 以下处理程序:
def get(self, resource_id=None, field=None):
try:
if resource_id is None:
response = self.resource.query.filter_by(is_deleted=False).all()
else:
record = self.resource.query.get(int(resource_id))
if field is None:
response = record
else:
response = {field: getattr(record, field)}
self.db.session.commit()
except Exception, e:
self.db.session.rollback()
self.send_error(500, message=e.message)
self.write(response)
Everything's pretty straightforward, except Content-Type is not getting set. 一切都很简单,除了Content-Type没有设置。 Note that any other header is being set properly. 请注意,正确设置了任何其他标头。
What's going on? 这是怎么回事?
It seems this is a 304 Not Modified
response. 看来这是一个304 Not Modified
响应。 Remember only the first 200 OK
response contains Content-Type
header. 请记住,只有前200 OK
响应包含Content-Type
标头。 The following response will neglect this header if you are requesting the same resource. 如果您请求相同的资源,以下响应将忽略此标头。
And beware that you don't actually need to explicitly set the Content-Type
. 请注意,您实际上并不需要显式设置Content-Type
。 If you look into the source code of Tornado, you will find this in the comment of write(self, chunk)
: 如果你查看Tornado的源代码,你会在write(self, chunk)
的注释中找到它:
If the given chunk is a dictionary, we write it as JSON and set the Content-Type of the response to be
application/json
. 如果给定的块是字典,我们将其写为JSON并将响应的Content-Type设置为application/json
。 (if you want to send JSON as a differentContent-Type
, call set_header after calling write()). (如果要将JSON作为不同的Content-Type
,请在调用write() 之后调用set_header)。
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