tornado | 易学教程

Why would an image fail to load from CSS when the path is correct, but loads when URL entered directly?

阅读更多关于 Why would an image fail to load from CSS when the path is correct, but loads when URL entered directly?

问题 I have a situation where css background-images are failing to load in my webapp. That is odd about this is that they are using absolute paths (beginning with "/") and that the paths are correct. When I expect the element with DOM Inspector, firefox gives the error "Could not load the image." Yet, if I click on that link, the image opens in a new tab, showing that the path is correct. Demonstration: https://qa.hubble.in/#subscriptions On the upper-right of this page, there are five squares.

Tornado框架简介（二）

阅读更多关于 Tornado框架简介（二）

--------------------Application-------------------- 1、settings 1、debug=True：，设置tornado是否工作在调试模式，默认为False即工作在生产模式。当设置debug=True 后，tornado会工作在调试/开发模式，在此种模式下，可以根据设置修改tornado提供的其他几种特性 2、autoreload=True：自动重启，tornado应用会监控我们的源代码文件，当有改动保存后便会重启程序，这可以减少我们手动重启程序的次数。需要注意的是，一旦我们保存的更改有错误，自动重启会导致程序报错而退出，从而需要我们保存修正错误后手动启动程序。 3、compiled_templite_carch = False：取消缓存编译的模板 4、static_hash_cache = False：取消缓存静态文件hash值 5、server_traceback = True：提供追踪信息，当RequestHandler或者其子类抛出一个异常而未被捕获后，会生成一个包含追踪信息的页面 6、 import tornado.web app = tornado.web.Application([],debug=True) 2、路由映射 1、Application中列表中的信息 app = tornado.web

What happens in Tornado if an error occurs during streaming?

阅读更多关于 What happens in Tornado if an error occurs during streaming?

问题 I'm writing a streaming POST request handler in Tornado, using the @stream_request_body class decorator and implementing the data_received method to handle chunked data. I have some resources that I want to ensure are closed when the request has been serviced. If an error occurs within data_received , I can catch the exception, clean up resources and call send_error . But what happens if the connection is closed by the client? Does post get called in that case? 来源： https://stackoverflow.com

Why does ctrl + c not stop tornado server?

阅读更多关于 Why does ctrl + c not stop tornado server?

问题 Why does ctrl + c not stop tornado server on windows ? This code is not executed: print 'get sig:%d' % signum import signal import tornado import tornado.web import tornado.httpserver class DefaultHandler(tornado.web.RequestHandler): def get(self): self.set_status(200, 'OK') self.write('hello guest') def post(self): self.get() class Receiver(object): def __init__(self, address=None, port=8100, gzip=False): if not address: address = '0.0.0.0' self.address = address self.port = port self.gzip =

Tornado next query string URL parameter

阅读更多关于 Tornado next query string URL parameter

问题 Question Since Tornado append a next query string parameter, which contain the URL of the resource building the redirect URL, sometimes we can redirect the user back to the referring page after login or logout applying line self.redirect(self.get_argument("next", "/")) But when I use this in the following code, It didn't work. Without login, when visiting Page /test , it will redirect to /login?next=%2Ftest , but the parameter next is always null and it will be redirect to root page instead

Error: types.coroutine() expects a callable

阅读更多关于 Error: types.coroutine() expects a callable

问题 I have the following class: from tornado import gen class VertexSync(Vertex): @wait_till_complete @gen.coroutine @classmethod def find_by_value(cls, *args, **kwargs): stream = yield super().find_by_value(*args, **kwargs) aggr = [] while True: resp = yield stream.read() if resp is None: break aggr = aggr + resp return aggr TypeError: types.coroutine() expects a callable Can you tell me what the problem is? => edit Code calling this function print(DemoVertex.find_by_value('longitude', 55.0))

Tornado how to return error exception?

阅读更多关于 Tornado how to return error exception?

问题 I want to run a method I know this method doesn't work and I want to get the error returned by the method. This is my code : def is_connect(s): print("ok connection") print(s) ioloop.stop() try: current_job_ready = 0 print("ok1") beanstalk = beanstalkt.Client(host='host', port=port) print("ok1") beanstalk.connect(callback=is_connect) ioloop = tornado.ioloop.IOLoop.instance() ioloop.start() print("ok2") except IOError as e: print(e) And this is the error I have when I run my program with wring

How to pass websocket to child process in Python Tornado?

阅读更多关于 How to pass websocket to child process in Python Tornado?

问题 I have a Tornado-server with some Websockethandler. I want to make a pool of workers in order to start a worker as a child process and to pass websocket connection to the worker. After the worker has finished it should send an answer to the client. def worker(message): inp_dict = json.loads(message) t = inp_dict["time"] time.sleep(t) return "Hello, World! "*int(t) class WebSocket(tornado.websocket.WebSocketHandler): def check_origin(self, origin): return True def open(self): print("WebSocket

Python xmpp jabber client in tornado web application

阅读更多关于 Python xmpp jabber client in tornado web application

问题 I am desktop programmer but I want to learn something about web services. I decided for python. I am trying understand how web applications works. I know how to create basic tornado website (request - response) and working jabber client, but I don't know how to mix them. Can I use any python components in web services? Does they must have specific structure ( sync or async )? Because I'm stuck in loop handlers: If tornado start web serwer by command: app = Application() app.listen(options

Using StaticFileHandler to host a file on Tornado Python

阅读更多关于 Using StaticFileHandler to host a file on Tornado Python

问题 Hi I am attempting to use StaticFileHandler in Tornado and for the most part its working, except its outputting the file (.csv) in a webpage when I click download. The only way I can save the file is Right clicking and saying save target as (but this doesn't work in all browsers). How can I force the file to be downloaded? I know I need to somehow set the header of the StaticFileHandler like this: self.set_header('Content-Type','text-csv') self.set_header('Content-Disposition','attachment')