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This serial aired on on 31 October 2016. .First shown inPakistanOriginal release31 October 2016 ( 2016-10-31) –18 April 2017 ( 2017-04-18)ChronologyPreceded byMoved to Wednesdays and Thursdays at 9:10pmEndedFollowed byExternal linksKuch Na Kaho (: کچھ نہ کہو‎; lit: Don't Say Anything) is a serial which is based on a novel named Sabz Ruton Ka Pehla Phool by Rahat Jabeen. It is given Mondays and Tuesdays 9:10 pm slot. Kuch na kaho stage drama.

1. What Does Download Mean In Computer Terms
2. What Does Download Mean In Filezilla
3. What Does Download Mean On Computer
4. What Does Download Mean In Internet
5. Upload Vs Download Meaning

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I often hear people say download with HTTP. What does it really mean technically?

HTTP stands for Hyper Text Transfer Protocol. So to understand it literally, it is meant for text transferring. And I used some sniffer tool to monitor the wire traffic. What get transferred are all ASCII characters. So I guess we have to convert whatever we want to download into characters before transferring it via HTTP. Using HTTP URL encoding? or some binary-to-text encoding schema such as base64? But that requires some decoding on the client side.

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I always think it is TCP that can transfer whatever data, so I am guessing HTTP download is a mis-used word. It arise because we view a web page via HTTP and find some downloadable link on that page, and then we click it to download. In fact, browser open a TCP connection to download it. Nothing about HTTP.

Anyone could shed some light?

smwikipediasmwikipedia

7 Answers

The complete answer to What does HTTP download exactly mean? is in its RCF 2616 specification, that you can read here: http://tools.ietf.org/html/rfc2616

Of course that's a long (but very detailed) document.

I won't replicate or summarize its content here.

In the body of your question you are more specific:

So to understand it literally, it is meant for text transferring.

I think the word 'TEXT' it misleading you.

And

have to convert whatever we want to download into characters before transferring it via HTTP

is false. You don't necessarily have to.

A file, for example a JPEG image, may be sent over the wire without any kind of encoding. See for example this: When a web server returns a JPEG image (mime type image/jpeg), how is that encoded?

Note that optionally a compression or encoding may be applied (the most common case is GZIP for textual content like html, text, scripts..) but that depends on how the client and the server agree on how the data have to be transferred. That 'agreement' is made with the 'Accept-Encoding' and 'Content-Encoding' directives in respectively the request's and the resonse's headers.

PaoloPaolo

I understand the name is misleading you, but if you read Hyper Text Transfer Protocol as a Transfer Protocol with Hypertext capabilities, then it changes a bit.

When HTTP was developed there were already lots of protocols (for example, the IP protocol, which is how data are widely transmitted between servers on the internet) but there were not protocols that allowed for easy navigation between documents.

HTTP is a protocol that allows for transferring of information AND for hyper text (i.e. links) embedded within text documents. These links don't necessarily have to point to other text documents, so you can basically transmit any information using HTTP (the sender and the receiver agree on the type of document being sent using something called the mime type).

So the name still makes sense, even if you can send things other than text files.

HTTP stands for Hyper Text Transfer Protocol. So to understand it literally, it is meant for text transferring.

Yes, text transferring. Not necessarily plain text, but all text. It doesn't mean that your text has to be readable by a person, just the computer.

What Does Download Mean In Computer Terms

And I used some sniffer tool to monitor the wire traffic. What get transferred are all ASCII characters.

Your sniffer tool knows that you're a person, so it won't just present you with 0s and 1s. It converts whatever it gets to ASCII characters to make it readable to you. Alle communication over the wire is binary. The ASCII representation is just there for your sake.

So I guess we have to convert whatever we want to download into characters before transferring it via HTTP

No, not at all. Again, it's text – not necessarily plain text.

I always think it is TCP that can transfer whatever data, [..]

Here you're right. TCP does transfer all data, but in a completely different layer. To understand this, let's look at the OSI model:

What Does Download Mean In Filezilla

When you send anything over the network, your data goes through all the different layers. First, the application layer. Here we have HTTP and several others. Everything you send over HTTP goes through the layers, down through presentation and all the way to the physical layer.

So when you say that TCP transfers the data, then you're right (HTTP could work over other transport protocols such as UDP, but that is rarely seen), but TCP transfers all your data whether you download a file from a webserver, copy a shared folder on your local network between computers or send an email.

kbakba

HTTP can transfer 'binary' data just fine. There is no need to convert anything.

Julian ReschkeJulian Reschke

HTTP is the protocol used to transfer your data. In your case any file you are downloading.

SeverinSeverin

You can either do that(opening another type of connection) or you can send your data as raw text. What you'll send is just what you would see when opening the file in a text editor. Your browser just decides to save the file in your Downloads folder(or whereever you want it) because it sees the file type is not supportet(.rar, .zip).

What Does Download Mean On Computer

If you look at OSI model, HTTP is a protocol that lives in the application layer. So when you hear that someone uses 'HTTP to transfer data' they are referring to application layer protocol. An alternative would be FTP or NFS, for example.

Browser indeed opens TCP connection, when HTTP is used. TCP lives in the transport layer and provides reliable connection on top of IP.

HTTP protocol provides different verbs that can be used to retrieve and send data, GET and POST are the most common ones. Look-up REST.

Eugene S.

What Does Download Mean In Internet

Eugene S.

Upload Vs Download Meaning

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