app.use("/uploads", express.static("./server/uploads"));
Everytime I access http://localhost:4500/uploads/16562754008013gncm1.jfif , it automatically downloads
-index.js
-server
----uploads
-------16562754008013gncm1.jfif
Folder Structure in Express
It may be that part of your problem is that .jfif is perhaps a file extension that Express and the browser don't know and recognize so the only thing a browser knows to do with it is offer a download dialog in the browser. You can verify this by looking in the network tab of the Chrome/Edge or Firefix inspector and look at what the content-type is set to when the response comes back from the server.
If Express recognizes the file extension, it will set the appropriate content-type. And, if the browser recognizes the content-type, it will treat it appropriately. If not, Express will set a generic content-type and the browser won't know what to do with it other than offering a download dialog.
You can fix that by either giving the file a file extension that is generally known that corresponds to its actual type or you can manually override and set the content-type (if that content-type is something that the browser recognizes).
Related
I am using Apache server with mod_expires enabled. I have setup headers so that static files expire a week later. File is request via jQuery.get() method, cache set to true.
However, when I refresh the page on browser (Firefox), it always requests the file again. Caching and header field values seem to have no effect.
Below is a screenshot from Firefox developer tools.
How did you come up with the If-None-Match value? I don't see an ETag header with that value. Server will always send you a new one.
Another thing note is browser reload behaviour. By asking a refresh you may be asking for an end to end reload which bypasses all the caches, afaik.
I sense I'm going to end up embarrassed for asking such a simple question, but I've been researching for days and can't any useful information.
What determines the HTTP response header that a server sends? If I control the server (if we need concreteness, let's say Apache), then what file can I edit to change the response header? For example, to set it to include Content-Length instead of Transfer-Encoding: chunked?
I'm aware that PHP and Java Servlets can be used to manipulate headers. The existence and content of response headers is fundamental to HTTP, though, so there ought to exist a way to edit these without using outside technology, no?
Certain headers are set automatically. They are part of the HTTP spec and the server takes care of them for you. That’s what a web server is for and why it differs from, say, an FTP server or a fileshare. For example Content-Length is easily calculated by the webserver and needs to be set so the server just does it.
Certain other headers are set based on config. Apache usually loads a main config file (often called httpd.conf or apache2.conf) but then, to save this file getting into a big unwieldy mess it often loads other files from within that. Those files are just text files with lines of configuration text to change behaviour of the server. Other web servers may use XML configuration files and may have a GUI to control the config (e.g. IIS)
So, for some of the headers, you might not explicitly set the header value but you basically configure the server and it then uses that config to figure out the appropriate headers to send. For example you can configure the server to gzip certain files (e.g. text files but not jpgs which are already compressed). In Apache this is handled by the mod_deflate module and the config options it gives you. Once the appropriate config is added to the server config, the server will do the necessarily processing (e.g. gzip the file or not depending on type) and then automatically add the headers. So an Apache module is basically something that changes how the server works and this may or may not the also set headers. Another example is for sending caching headers to tell the browser how long to cache files for. This is controlled by adding the mod_expiries module and all the config options it allows. While some of these headers could be hardcoded (e.g. Cache-Control) others depend on Apache doing calculations (e.g. Expires) so better to use the module to do this for you based on your config.
And finally you can explicitly set headers in your server (in Apache this is done using the mod_headers module). This is useful for new features added to browsers for example (e.g. HSTS, CSP or HPKP) where the server doesn't need to do anything but just add the header and the client (e.g. the web browser) knows what to do with them. You could add a JonahHuron header for example by adding this config to httpd.conf:
Header always set JonahHuron "Some Value"
As to whether that header is used depends entirely on the program receiving the response.
Is it possible to DiskCache non-image files without losing their type when rendered in the browser?
I followed the instructions on this page:
http://imageresizing.net/docs/v4/howto/cache-non-images
Per the instructions, I set PostAuthorizeRequestStart = True and cache = Always in the PostAuthorizeRequestStart event. I also added the .unknown mimeType in the config.
However, when an xml file is requested, it's returned as content-type "application/octet-stream" instead of "text/xml".
Is there anyway to preserve the original content-type of non-image files?
I'm afraid not - at least not without modifying ImageResizer source code.
We made the decision to prioritize security, and save all files with the ".unknown" extension to prevent them accidentally being executed as scripts by IIS. IIS sends the content-type based on the file extension, and (depending on your IIS configuration), the extension determines if the file should be executed as code.
I see no harm in expanding the "whitelist" of extensions to include non-image file types, as long as we're reasonably confident that other users haven't allowed IIS to consider those file types executable.
The code that would need to be modified (in v4+), would be HttpModuleRequestAssistant.EstimateResponseInfo. Instead of falling back to "unknown" immediately, a second whitelist could be consulted.
If you file an issue on GitHub about this, you can subscribe to notifications. We'd definitely accept a pull request addressing this feature request, particularly during the current v4 prerelease phase when changes to the pipeline are less risky.
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.
Would like to ask, can we configure a RDP file in the client side to launch a specific url?
I already have a RDP file that will launch IE in the server. I would like a specific url being launch together with the IE.
I notice,the url can be added as a commandline argument in the properties of the RemoteApp.
But,it is possible for us to set the url in RDP file in the client side ? (The file can be opened as notepad correct? Can we edit there?)
Thanks a lot in advance,
RDP files are plain text. As far as I know, the full RDP file format is not documented, but as you noticed, it is rather easy to read.
The command line arguments are passed via the remoteapplicationcmdline:s: parameter.
If you change the file, you will get certificate errors unless you re-sign it with rdpsign.