When the user opens a website, the browser tries to establish a TCP connection. It works if the website is using HTTP/1-2. However, it will not work if the website is using HTTP/3, since it requires QUIC. The question is: how the browser knows whether it should use TCP or QUIC?
Please direct yourself to the following URL down below which is the one for HTTP version 3 specifications.
https://datatracker.ietf.org/doc/html/rfc9114
Have a good one!
Related
The question is pretty straightforward. I want to know if there are ways of discovering the HTTP requests my browser sends while I navigate. For instance, what happens when I click on a certain link which sends a PUT method? I mean, I wish I could determine the exact HTTP request that my browser sends to that website. Further, I want to, later, reproduce that request on Curl. Basically, I want to inspect requests my browser sends so I can automate that task later through the Curl command (command, not library).
Thanks in advance!
Fernando.
Fiddler does exactly what you want. It sets up a proxy that can monitor http communication from your browser.
http://www.fiddler2.com/fiddler2/
You would want the Firebug extesion for Firefox. It can show a lot of what is happening, and you can add more options by installing more extensions.
On the other hand, you can use wireshark to capture the traffic to and from your computer.
Then you can use filters to save the relevant packets (pcap is often the format for storing the packets).
Later, you can replay the packets using tools like tcpreplay.
You could try it out with backtrack linux (live cd/usb).
And nowadays there should be some new tools for windows also. :)
EO2 and JohnnyC are correct. Fiddler, WireShark, FireBug (FireFox addon), etc. are what you are going to look for. You can use them free of charge.
WireShark will capture all incoming and outgoing traffic on your box. You can listen on any port, filter data etc.
FireBug will capture outgoing and incoming data streams, the raw data (XML, JSON, images etc.) for each request.
Fiddler is great for tracking web data in a seperate application if you do not use FireFox.
There are a specific set of process happens between a user hits www.google.com and see the page in the browser. Can anybody tell me what all things that happen during a similar process. Also how mobile browser is different from web browser.
This really depends on what browsers you're comparing. For example, Safari Mobile and Safari for Mac are quite similar to one another, so much so that you often see the same page on both. However IE for Pocket PCs is much different than IE8 and pages would render somewhat differently in those two.
Usually, site operators check the UserAgent string that all browsers have, to see which browser it is. Then, it's up to the site operator to show a mobile site or a regular site based on whether they want to or not.
PPK has a great list of all browser quirks and features, at quirksmode.org. It's a must-read for mobile development.
Name resolution. www.google.com gets resolved to an IP address through domain name
HTTP Request. The browser sends a GET request to server.
HTTP Response. The server sends back an HTTP response.
Parse. The client parses the resulting document and resolves referenced assets (css, images, etc)
HTTP Requests. For each referenced asset, the browser sends another request to the server.
HTTP Response. For each referenced asset, the server responds.
In this respect, how http is requested, mobile is not different than desktop.
Aame stuff happens, mobile browser(s) renders html documents like your pc browser(s).
Of course they might have have less memory, different rendering engine(s), run on a very small screen etc etc etc. But, at the end it is just another http request to google.com.
Depending on network or connection type to the net there might be another difference. Operator gateway/proxy. Some operators filter/proxy all communication to the net.
Also (usually) internet traffic from operator's customers to the net routed through couple of public IPs
Hallo, developing a bb app I need to make http connections to get files, images etc.
In simulator all works, but not in device.
I bought a BlackBerry but I want to test my app without a sim then without a bes.
How do I need to set my device? and how do I have to compose my url?
I just have a bb device with wifi available
Thanks all :)
Sergio
As answered for this duplicate question...
This was a tough one for me!
As Mark said you have to put some parameters in the url to make it work on the device. You shouldn't do it by hand but use the ConnectionFactory instead.
As you may thing this would just make it work but it doesn't!
The real problem is that not the url has been altered because it has ;interface=wifi;deviceside=true in it (in my case). Depending on the webserver accepting your request this could broke the code.
A solution I tried and that works is try to happend a fake parameter like
&foo=true -> &foo=true;deviceside=true
This will result as a standard parameter for the webserver but your device would use it to driver your connection.
On the simulator this work without this extra code because behind it there is a BIS server for you. On the device (as in my case) there isn't because I'm using a development device unregistered and without SIM (just wifi).
Another point is that the HttpConnection class doesn't handle HTTP 302 Redirect and if you get one you have to handle it manually.
Try appending ";interface=wifi" onto the URL when using a device (instead of ";deviceside=true"). This will force a Wi-Fi connection (assuming the device has Wi-Fi).
So, I have a Blackberry 9000 application doing simple networking using HttpConnection. Everything works fine normally, when I go to urls of the form:
http://url.com
But I've discovered that I need to test this in wifi only situations (that is, without a BES or equivalent in sight). After some digging, I discovered that I need to add:
;interface=wifi
To all of my URLS, of the form:
http://url.com;interface=wifi
However, I'm noticing that this does not actually work, it gives me back a HTTP error 406. Which according to wiki is a:
406 Not Acceptable
The requested resource is only capable of generating content not acceptable according to the Accept headers sent in the request.[2]
Am I doing something completely wrong? Does Blackberry wrap wifi only requests in headers that require particularly formatted websites?
As explained on this page, you also need add "deviceside=true" to the URL.
To specify that the underlying TCP
connection should be opened directly
from the handheld, set this parameter
to "true". Specify "deviceside=false"
when receiving or sending data through
the BlackBerry MDS Connection Service.
So your full URL would be:
http://url.com;interface=wifi;deviceside=true
I want to know that when browser sends a request do the server sends back the contents explicitly? And how would i confirm it?
There are several toolbars in Firefox that show exactly what are coming and going when making an HTTP request.
For firefox i use the following plugins:
Firebug
Web Developer
You could also install a utility called WireShark. It will "sniff" all the network traffic on your computer and show you at a packet level how it all works.
Browser plugins such as firebug (for firefox) let you see exactly what the server is returning; that's quite instructive and recommended! You'll see a bunch of headers followed by the response body in any of several formats (could be chunked, etc, etc).
In a Windows environment you can use Fiddler.
Fiddler includes a fair amount of documentation and is easy to use.