I am trying to download a property list from a webserver using -initWithContentsOfURL
The problem I am having is that Cocoa caches the response from the webserver and so the file I am trying to download. This means that the first time it will work fine but the second time, the file on the server has changed, it won't work properly. It just "downloads" ( just copies it from the cache.db database ) the old file.
What is the best way to work around this? Would I have to implement something more "sophisticated" like NSURLDownload?
What are the HTTP headers in the response? Try this at the terminal:
curl -I http://the-uri-for-the-plist
It is possible the server is specifying that the file can be cached.
Related
I know it is possible to flush all cache, or to set single file expirations, but I'm curious to know if there's some way to flush a single file via http request;
something like curl -X DELETE www.example.com/js/a_cached_example.js.
Is it possible? How?
It is not possible to do that in 1.8, but it will be possible in 1.9 or from a trunk build, as of https://code.google.com/p/modpagespeed/source/detail?r=4069
It will work pretty much exactly as you predicted if you set the request-method to DELETE in the conf file, though PURGE is what we thought was more common. You will also be able to do that from the admin console (/pagespeed_admin).
I'm writing an apache2 module
by default and when viewed in a web browser, the module would only print the first lines of a large file and convert them to HTML.
if the user choose to 'download as...', the whole raw file would be downloaded.
Is it possible to detect this choice on the server side ? (for example is there a specific http header set ?).
note: I would like to avoid any parameter in the GET url (e.g: "http://example.org/file?mode=raw" )
Pierre
added my own answer to close the question: as said #alexeyten there is no difference. I ended by a javascript code the alter the index.html file generated by apache.
I am trying to find a way to make sure browsers dont cache versions of my css files everytime I push a new update.
I was thinking the best way would be to somehow get the file timestamp of the css file on the filesytem and append append it tot he css URL somehow like www.mysite.com/css/style.css?13245645434
Is this possible at all? If not, then any idea how i can make sure the browser gets a new version of the file when it is updated? I dont want to eliminate browser cache all together because if the file hasnt been touched then i would like it to be cached. However, when i push a new update i would like to someone tell the browser that.
I understand i can write server side code to put the style.css?2342343 in but i want to see if its possible through apache at all.
Thanks
everytime I push a new update
How do you push updates? If there is an automated build process you have then that is the right place to rewrite your URLs.
If you wanted to do the rewriting via apache you'd need a module which would parse the html and rewrite the links. That would not be optimal.
Lastly, consider rewriting to /css/42/style.css (where 42 is the current version) because in case you cache your site through a proxy or CDN, query parameters may not work.
I'm building a web tool which allows users to upload PDFs to a server using their web browsers. The server is based on Python (Paste + Pyramid).
The problem I have right now is the following: If a user uploads a rather large file (let's say 100 MB) and they cancel the upload before it is completed, my handler code on the server is still called (instead of the request being aborted).
The problem is that the request.POST['myfile'].file is incomplete when that happens. This effectively means that the PDF file is corrupted if I simply write it to some place on the server.
When I watch the server's log, it shows a "broken pipe" exception within the Paste server; however I have no idea how to catch that exception and have it prevent my view/handler code from executing and storing the incomplete file.
Seems like the paster HTTP server does not correctly validate the uploaded form data and simply passes the request down the WSGI pipeline even if the connection (HTTP POST) was closed by the user.
I worked around this issue by simply setting up NGINX to act as a reverse proxy. This also adds some security benefits as it might be better tested than paster.
Update:
My main problem was that I was using runserver (the built in web server of manage.py). After some trial and error we ended up using WSGI.
More specifically, uWSGI and Nginx as web server. Static content is served directly by Nginx while dynamic pages are piped through uWSGI and are handled by the Python web app.
Unless you are doing something fancy (like tracking the upload progress, etc), your pylons controller should not be invoked until the entire file has been uploaded.
How do I get a status report of all files currently being uploaded via HTTP form based file upload on an Apache Server?
I don't believe you can do this with Apache itself. The upload looks like nothing more than a POST as far as Apache cares. There are modules and other servers that do special processing to uploads so you may have some luck there. It would probably be easier to keep track of it in your application.
Check out SWFUpload, its uses Flash (in a nice way) to assist with managing multiple uploads.
There are events you can monitor for how many files of a set have been uploaded.