on a website I display links to PDF files.
When the first time call for a file arrives, the request gets redirected to a php-script that generates and returns the file. Additionally, it saves the file to the linked location so next time it will be directly availibe. I send the pdf mime type to make the browser open a download dialog instead of redirecting.
Due to reasony beyond my control, one out of 20 files cannot be generated.
How to respond?
Error 404 or 500 would direct the browser to an error page, while sending a mime-type would let the user download an empty / defect pdf file. Is there an established best practise? How to let the user know that a file link is broken, yet keep him on the site without redirect?
I had the same problem and solved it as follows:
If you have link to file, for example:
<a download href="/files/document.pdf">Click to download</a>
And if you don't want the browser redirect to blank/error page if the file doesn't exist, just reply with 204 without any content.
Nothing will happen, the user will stay where he is without redirection.
In php it would look something like this:
if (!readfile("/files/document.pdf") {
http_response_code(204);
die();
}
Related
When I try to download the text file in sensenet, the text file will open in browser but not downloaded, could you give some suggestions about how to set to download text file directly?
It's handled by the browser. If it can open a certain file type, then it will show it instead of downloading.
On server side you can force to download file types on your website if your http handler use disposition when set response stream:
response.AppendHeader("Content-Disposition", "attachment");
With sensenet you have to write your own http handler or modify ProcessRequest of SenseNetStaticFileHandler.cs.
MSDN is not too helpful on this topic, but you can find some information on this here.
On client side there is another solution, if you can change the html code of the link. With html5 <a> tag has got a download attribute that forces the linked file to download instead of navigate the browser to it. It works if the browser supports it. See HTML download Attribute.
I need to render following pages on my website:
http://xxx/packages/most-popular-hennan-boracay-regency.html
http://xxx/packages/super-special-with-pickup-la-carmela.html
http://xxx/packages/adventures-boracay-atv-buggy-car.html
But whenever I hit these URLs in my browser, my URL is transformed in following:
http://xxx/packages/most-popular-hennan-boracay-regency
http://xxx/packages/super-special-with-pickup-la-carmela
http://xxx/packages/adventures-boracay-atv-buggy-car
And a 404 not found error is displayed.
I have checked my .htaccess and found nothing suspicious.
Also checked MIME Types section in CPanel.
Still unable to figure it out.
So, please help.
When users click on a link to a file (eg: csv, zip), there are two things that could happen:
If the file exists: it starts downloading (the web page does not change).
If the file does not exist: the user will be redirected to a 404 page (default or custom).
If when the file exists there's no redirection (or to be proper, the user doesn't get the idea of), why is there a redirection when the file doesn't exist?
I understand that when the browser gets a 404 response code, it needs to somehow display it to the user, but shouldn't it take into consideration the event that triggered the request? It is not the same to type an incorrect URL in the address bar than to click on a link. Wouldn't the browser showing an alert and remaining on the same page be a more "appropriate behavior"?
It would be relatively easy to create some back-end (or front-end) script that checks all the links, verifies if the files exists (or not), and then replaces the behavior accordingly. But is there something different that can be done? is it possible to (programatically) change the browser's settings so it doesn't redirect if the file doesn't exist? Or have the server return an HTTP code different than 404 (maybe in the 400s family) to cause such behavior?
I am developing a windows application in vb.net in which i have a url which first ask me to login on the website and then display a view pdf link. As i make it click it again redirect to another page where instead of asking for download pdf it opens it in my web browser control. Now i want to save that opened pdf on my specified path. I have googled a lot but didn't find any solution for the same. I even found some related posts but none of them have my answer. Here my pdf url doesnt contains any file name like '.pdf'. Url contains some token values. To open this url it requires login on the website. I am trying to download pdf file for many days. Please help me.
you have to push your file using http headers
Unique HTTP Headers Returned
because these headers are the only thing controlling how your browser handles the file.
Save As Mode (askapache_pdf=s)
Content-Disposition: attachment
Content-Type: application/pdf
for more info goto http://www.askapache.com/htaccess/pdf-cookies-headers-rewrites.html#Unique_HTTP_Headers_Returned
This does not have anything to do with server side scripting language its same that you have to add a response in your header of http request. But anyway in ASP you should try something like below
Response.AddHeader("content-disposition", "attachment;filename=somefile.ext")
I went to Twitter's resource page here (https://twitter.com/about/resources/tweetbutton) and got the following code:
Tweet<script type="text/javascript" src="//platform.twitter.com/widgets.js"></script>
When I put this in my Wordpress template, I don't get the Twitter button -- I just get the text "Tweet". However, when I change the src for widgets.js to include https:// or http:// at the beginning it works.
Could it be that it's just an error that they forgot the protocol? Also, do you think it is better to use https (for consistency with the share link) versus http, or does it not matter?
Thanks for your suggestions.
The URL "//example.com/script.js" tells the browser to open the URL using the protocol of the current page, which is likely to be "file://" if your browser opened an html file on your own machine. Of course, you don't have a file called "file://example.com/script.js" on your computer.
In the past, urls for embedded widgets used to include the protocol (http or https), but a site visitor would receive warnings whenever a secure page loaded a script from an insecure page, and sometimes even vice versa. Now, widgets from Twitter, Google Analytics, and other sites no longer specify the protocol so that the same embed code can work on any page on the internet. The downside is that this does not work when you embed such a widget into a file and view it on your own browser by double-clicking it!