Downloading a file served by a tornado web server

[Eric]

This is how I have my tornado web server currently defined:

application = tornado.web.Application([

    tornado.web.url(r"/server", MainHandler),

    tornado.web.url(r"/(.*)", tornado.web.StaticFileHandler, { "path": scriptpath,  "default_filename": "index.html" }),

])

index.html is the start page of a web based gui. It will communicate with the backend server through http://<address>/server and the requests by the gui to the server are handled by the MainHandler function.

The directory structure looks like:

root_directory/

    server.py

    fileiwanttodownload.tar.gz

    index.html

I would like to be able to type into the browser:

http://<address>/data/fileiwanttodownload.tar.gz

and have the file delivered to me as a regular file download.

What I have tried to do is:

application = tornado.web.Application([

    tornado.web.url(r"/server", MainHandler),

    tornado.web.url(r"/data", tornado.web.StaticFileHandler, { "path": scriptpath } ),

    tornado.web.url(r"/(.*)", tornado.web.StaticFileHandler, { "path": scriptpath,  "default_filename": "index.html" }),

])

But this is not working for reasons that are probably obvious to those who know the answer.

The only clue I have is the following error message:

Uncaught exception GET /data (192.168.4.168)

HTTPServerRequest(protocol='http', host='192.168.4.195:8888', method='GET', uri='/data', version='HTTP/1.1', remote_ip='192.168.4.168', headers={'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_2) AppleWebKit/601.3.9 (KHTML, like Gecko) Version/9.0.2 Safari/601.3.9', 'Host': '192.168.4.195:8888', 'Accept-Encoding': 'gzip, deflate', 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', 'Connection': 'keep-alive', 'Accept-Language': 'en-us'})

Traceback (most recent call last):

  File "/usr/local/lib/python3.4/dist-packages/tornado/web.py", line 1445, in _execute

    result = yield result

  File "/usr/local/lib/python3.4/dist-packages/tornado/gen.py", line 1008, in run

    value = future.result()

  File "/usr/local/lib/python3.4/dist-packages/tornado/concurrent.py", line 232, in result

    raise_exc_info(self._exc_info)

  File "<string>", line 3, in raise_exc_info

  File "/usr/local/lib/python3.4/dist-packages/tornado/gen.py", line 267, in wrapper

    result = func(*args, **kwargs)

TypeError: get() missing 1 required positional argument: 'path'

[Ben Darnell]

On Wed, Jan 13, 2016 at 4:20 PM, Eric <eric...@gmail.com> wrote:

This is how I have my tornado web server currently defined:

application = tornado.web.Application([

    tornado.web.url(r"/server", MainHandler),

    tornado.web.url(r"/(.*)", tornado.web.StaticFileHandler, { "path": scriptpath,  "default_filename": "index.html" }),

])

index.html is the start page of a web based gui. It will communicate with the backend server through http://<address>/server and the requests by the gui to the server are handled by the MainHandler function.

The directory structure looks like:

root_directory/

    server.py

    fileiwanttodownload.tar.gz

    index.html

You probably want to put fileiwanttodownload.tar.gz in another directory by itself, so people can't ask for /data/server.py.

 

I would like to be able to type into the browser:

http://<address>/data/fileiwanttodownload.tar.gz

and have the file delivered to me as a regular file download.

What I have tried to do is:

application = tornado.web.Application([

    tornado.web.url(r"/server", MainHandler),

    tornado.web.url(r"/data", tornado.web.StaticFileHandler, { "path": scriptpath } ),

    tornado.web.url(r"/(.*)", tornado.web.StaticFileHandler, { "path": scriptpath,  "default_filename": "index.html" }),

])

The `/(.*)` is important: it's the regex capturing group that tells StaticFileHandler where the filename is in the URL. The `/data` mapping needs to be `/data/(.*)`.

-Ben

 

But this is not working for reasons that are probably obvious to those who know the answer.

The only clue I have is the following error message:

Uncaught exception GET /data (192.168.4.168)

HTTPServerRequest(protocol='http', host='192.168.4.195:8888', method='GET', uri='/data', version='HTTP/1.1', remote_ip='192.168.4.168', headers={'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_2) AppleWebKit/601.3.9 (KHTML, like Gecko) Version/9.0.2 Safari/601.3.9', 'Host': '192.168.4.195:8888', 'Accept-Encoding': 'gzip, deflate', 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', 'Connection': 'keep-alive', 'Accept-Language': 'en-us'})

Traceback (most recent call last):

  File "/usr/local/lib/python3.4/dist-packages/tornado/web.py", line 1445, in _execute

    result = yield result

  File "/usr/local/lib/python3.4/dist-packages/tornado/gen.py", line 1008, in run

    value = future.result()

  File "/usr/local/lib/python3.4/dist-packages/tornado/concurrent.py", line 232, in result

    raise_exc_info(self._exc_info)

  File "<string>", line 3, in raise_exc_info

  File "/usr/local/lib/python3.4/dist-packages/tornado/gen.py", line 267, in wrapper

    result = func(*args, **kwargs)

TypeError: get() missing 1 required positional argument: 'path'

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[Eric]

Bingo. The solution was to do r"/data/(.*)"