How to ignore “Content-Disposition: attachment” in

问题:

How can I cause Firefox to ignore the Content-Disposition: attachment header? I find it absolutely annoying that I can't view an image in the browser, because it asks me to download it.

I don't want to download the file, I just want to view it in the browser. If the browser doesn't have a plugin to handle it, then it should ask to download.

E.g. I have Adobe Acrobat Reader installed as a plugin for Firefox. I click a link to a PDF, and it asks me to save it, when it should open in the browser using the plugin. This is the behaviour if the server does not send the Content-Disposition: attachment header in the response.

Firefox 3.6.6 Windows XP SP3

回答1:

The "Open in browser" extension is useful for formats supported natively by the browser, not sure about PDF.

回答2:

This is the Firefox addon you're looking for to fix this problem.

回答3:

Well, that's the purpose of disposition type "attachment".

The default behavior (when the header is absent) should be to display in-line.

Maybe there's a configuration problem in your browser, or the Reader plugin?

回答4:

For PDFs there is an addon called PDF-Download which overrides any attempt to download a PDF and lets the user decide how they want it downloaded (inline, save, external, etc). You could probably modify it to work for other filetypes too.

回答5:

You could write a firefox extension that removes the disposition header for PDF files. This would be a fairly simple extension.

回答6:

I also found this tonight that totally prevents Firefox from littering your desktop with downloads. It's actually a redirect fix to the hidden /private/temp folder in MAC. Genius.

You can mimic the Windows behaviour simply by changing [Firefox's] download directory to /tmp.

To do this, open Firefox's General preferences pane, under Save Downloaded Files To select [choose].... In the dialog that appears, hit Shift-Command-G to bring up the Go to Folder dialog.

In this dialog, simply type /tmp, hit OK, then hit Select in the main window.

回答7:

Since I was looking for a solution and no available add-on was actually working with my Firefox 31.0 (Ubuntu) I decided to try creating my own add-on.

The code if you want to archive a similar goal or just want to know how it works.

console.log("starting addon to disable content-disposition...");

//getting necessary objects
var {Cc, Ci} = require("chrome");

//creating the observer object which alters the Content-Disposition header to inline
var httpResponseObserver = {
    //gets fired whenever a response is getting processed
    observe: function(subject, topic, data) {
        if (topic == "http-on-examine-response") {
            var httpChannel = subject.QueryInterface(Ci.nsIHttpChannel);
            httpChannel.setResponseHeader("Content-Disposition", "inline", false);
        }
    }, 
    //needed for this.observerServer.addObserver --> without addObserver will fail
    get observerService() {
        return Cc["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);
    },
    //used to register with an observer
    register: function() {
        console.log("register with an observer to get response-events");
        this.observerService.addObserver(this, "http-on-examine-response", false);
    },
    //used to unregister from the observer
    unregister: function() {
        console.log("unregister from observer");
        this.observerService.removeObserver(this, "http-on-examine-response");
    }
};

//gets called at enable or install of the add-on
exports.main = function(options, callbacks) {
    console.log("content-dispostion main method got invoked");
    //call register to make httpResponseObserver.observe get fired whenever a response gets processed
    httpResponseObserver.register();
};

//gets called on disable or uninstall
exports.onUnload = function(reason) {
    console.log("content-dispostion unloaded");
    //unregister from observer
    httpResponseObserver.unregister();
};

/*

//not needed!!! just test code for altering http-request header

var httpRequestObserver =
{
  observe: function(subject, topic, data)
  {
    console.log("in observe...");
    console.log("topic is: " + topic);
    if (topic == "http-on-modify-request") {
      var httpChannel = subject.QueryInterface(Ci.nsIHttpChannel);
      httpChannel.setRequestHeader("X-Hello", "World", false);
    }
  },

  get observerService() {
    return Cc["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);
  },

  register: function()
  {
    this.observerService.addObserver(this, "http-on-modify-request", false);
  },

  unregister: function()
  {
    this.observerService.removeObserver(this, "http-on-modify-request");
  }
};
httpRequestObserver.register();
*/

As an alternative you can get my xpi-File to directly install the add-on in Firefox. If you want to disable the "Content-Disposition" altering just deactivate the add-on ;-).

http://www.file-upload.net/download-9374691/content-disposition_remover.xpi.html