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Updated Apr 13, 2026
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Osnove klijent-server modela veba: Kako funkcioniše komunikacija?
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Osnove klijent-server modela
Zamišljaj klijent-server kao razgovor između tebe i prodavca u radnji. Ti pitaš za neki proizvod (klijent), a prodavac ti odgovara i donosi ga (server).
Klijent je program koji traži informacije - najčešće tvoj Chrome ili Firefox pregledač. On uvek prvi počinje razgovor. Server je moćan računar koji radi 24/7 i čeka da mu neko pošalje zahtev.
Komunikacija ide ovako: klijent pošalje zahtev (request), server ga obradi i vrati odgovor (response). Za ovu komunikaciju koriste HTTP protokol - skup pravila kako da "pričaju" jedan sa drugim.
💡 Važno: HTTP je kao jezik koji govore klijent i server. HTTPS je samo sigurna, kriptovana verzija.
Svaki uređaj na internetu ima svoju IP adresu (npr. 192.168.1.1). Ali pošto je teško pamtiti brojeve, koristimo domene kao što je google.com.
Kako funkcioniše komunikacija korak po korak
Kad ukucaš www.wikipedia.org u pregledač, dešava se sledeće:
Prvo, pregledač mora da sazna IP adresu za wikipedia.org. Pošalje upit DNS serveru - to je kao telefonski imenik interneta. DNS odgovori sa tačnom adresom, npr. 208.80.154.224.
Zatim pregledač formira HTTP zahtev i šalje ga na tu adresu. Zahtev sadrži metodu (obično GET za dobijanje podataka), putanju i dodatne informacije.
Server prima zahtev, pronalazi odgovarajući fajl i sprema HTTP odgovor. Odgovor sadrži statusni kod (200 OK znači sve u redu, 404 znači stranica ne postoji), zaglavlja sa informacijama, i samo sadržaj - HTML kod stranice.
💡 Zapamti: Klijent uvek prvi priča, server samo odgovara. Server ne može sam od sebe da ti pošalje nešto.
Razlike između klijenta i servera
| **Klijent** | **Server** |
|---|---|
| Traži informacije | Pruža informacije |
| Uvek pokreće komunikaciju | Čeka na zahteve |
| Radi samo dok ga koristiš | Radi 24/7 |
| Chrome, Firefox, mobilne aplikacije | Apache, Nginx, serveri baza podataka |
Kada pregledač primi HTTP odgovor, on čita HTML kod i iscrtava stranicu koju vidiš. Ako HTML sadrži linkove ka slikama ili CSS fajlovima, pregledač šalje nove, odvojene zahteve za svaki resurs.
Statusni kodovi ti govore šta se desilo: 200 OK (uspeh), 404 Not Found (stranica ne postoji), 500 Internal Server Error (greška na serveru).
💡 Pametno: HTTP je "stateless" - server ne pamti prethodne zahteve. Zato postoje kolačići (cookies) da prate da li si ulogovan.
Praktični primeri komunikacije
Primer 1: Učitavanje sajta za automobile
Ukucaš www.polovniautomobili.com → DNS vraća IP adresu → pregledač šalje GET zahtev → server izvlači oglase iz baze → vraća HTML sa listom automobila → vidiš stranicu sa oglasima.
Primer 2: Logovanje na društvenu mrežu
Unosiš korisničko ime i lozinku → pregledač šalje POST zahtev (ne GET!) → server proverava podatke u bazi → ako su tačni, preusmerava te na početnu stranicu i postavlja kolačić → ako nisu, vraća poruku o grešci.
GET vs POST je bitna razlika: GET dobija podatke , POST šalje podatke serveru (sigurnije, podaci su skriveni).
💡 Za test: Server je "crna kutija" - ne znaš kako radi iznutra, samo šalješ zahteve po HTTP pravilima i očekuješ odgovore.
Ključni pojmovi za zapamćivanje
Za testove zapamti ovo:
- Dva glavna aktera: Klijent traži, server pruža
- Komunikacija: Klijent šalje zahtev, server vraća odgovor
- Protokol: HTTP definiše pravila razgovora
- Adresiranje: Domen → DNS → IP adresa
HTTP metode:
- GET: "daj mi podatke" (za čitanje)
- POST: "obradi ove podatke" (za slanje)
Statusni kodovi su server-ov način da ti kaže šta se desilo:
- 200 OK = uspeh
- 404 Not Found = stranica ne postoji
- 500 = greška na serveru
💡 Savet: Ovaj model možeš videti svugde - mobilne aplikacije, online igre, sve radi na klijent-server principu!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Informatika
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Osnove klijent-server modela veba: Kako funkcioniše komunikacija?
Sve što radiš na internetu - od Instagram-a do YouTube-a - funkcioniše na istom principu: klijent-server arhitekturi. Ovo je osnova celog interneta i ključ za razumevanje veb programiranja.
Osnove klijent-server modela
Zamišljaj klijent-server kao razgovor između tebe i prodavca u radnji. Ti pitaš za neki proizvod (klijent), a prodavac ti odgovara i donosi ga (server).
Klijent je program koji traži informacije - najčešće tvoj Chrome ili Firefox pregledač. On uvek prvi počinje razgovor. Server je moćan računar koji radi 24/7 i čeka da mu neko pošalje zahtev.
Komunikacija ide ovako: klijent pošalje zahtev (request), server ga obradi i vrati odgovor (response). Za ovu komunikaciju koriste HTTP protokol - skup pravila kako da "pričaju" jedan sa drugim.
💡 Važno: HTTP je kao jezik koji govore klijent i server. HTTPS je samo sigurna, kriptovana verzija.
Svaki uređaj na internetu ima svoju IP adresu (npr. 192.168.1.1). Ali pošto je teško pamtiti brojeve, koristimo domene kao što je google.com.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Kako funkcioniše komunikacija korak po korak
Kad ukucaš www.wikipedia.org u pregledač, dešava se sledeće:
Prvo, pregledač mora da sazna IP adresu za wikipedia.org. Pošalje upit DNS serveru - to je kao telefonski imenik interneta. DNS odgovori sa tačnom adresom, npr. 208.80.154.224.
Zatim pregledač formira HTTP zahtev i šalje ga na tu adresu. Zahtev sadrži metodu (obično GET za dobijanje podataka), putanju i dodatne informacije.
Server prima zahtev, pronalazi odgovarajući fajl i sprema HTTP odgovor. Odgovor sadrži statusni kod (200 OK znači sve u redu, 404 znači stranica ne postoji), zaglavlja sa informacijama, i samo sadržaj - HTML kod stranice.
💡 Zapamti: Klijent uvek prvi priča, server samo odgovara. Server ne može sam od sebe da ti pošalje nešto.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Razlike između klijenta i servera
| **Klijent** | **Server** |
|---|---|
| Traži informacije | Pruža informacije |
| Uvek pokreće komunikaciju | Čeka na zahteve |
| Radi samo dok ga koristiš | Radi 24/7 |
| Chrome, Firefox, mobilne aplikacije | Apache, Nginx, serveri baza podataka |
Kada pregledač primi HTTP odgovor, on čita HTML kod i iscrtava stranicu koju vidiš. Ako HTML sadrži linkove ka slikama ili CSS fajlovima, pregledač šalje nove, odvojene zahteve za svaki resurs.
Statusni kodovi ti govore šta se desilo: 200 OK (uspeh), 404 Not Found (stranica ne postoji), 500 Internal Server Error (greška na serveru).
💡 Pametno: HTTP je "stateless" - server ne pamti prethodne zahteve. Zato postoje kolačići (cookies) da prate da li si ulogovan.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Praktični primeri komunikacije
Primer 1: Učitavanje sajta za automobile
Ukucaš www.polovniautomobili.com → DNS vraća IP adresu → pregledač šalje GET zahtev → server izvlači oglase iz baze → vraća HTML sa listom automobila → vidiš stranicu sa oglasima.
Primer 2: Logovanje na društvenu mrežu
Unosiš korisničko ime i lozinku → pregledač šalje POST zahtev (ne GET!) → server proverava podatke u bazi → ako su tačni, preusmerava te na početnu stranicu i postavlja kolačić → ako nisu, vraća poruku o grešci.
GET vs POST je bitna razlika: GET dobija podatke , POST šalje podatke serveru (sigurnije, podaci su skriveni).
💡 Za test: Server je "crna kutija" - ne znaš kako radi iznutra, samo šalješ zahteve po HTTP pravilima i očekuješ odgovore.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Ključni pojmovi za zapamćivanje
Za testove zapamti ovo:
- Dva glavna aktera: Klijent traži, server pruža
- Komunikacija: Klijent šalje zahtev, server vraća odgovor
- Protokol: HTTP definiše pravila razgovora
- Adresiranje: Domen → DNS → IP adresa
HTTP metode:
- GET: "daj mi podatke" (za čitanje)
- POST: "obradi ove podatke" (za slanje)
Statusni kodovi su server-ov način da ti kaže šta se desilo:
- 200 OK = uspeh
- 404 Not Found = stranica ne postoji
- 500 = greška na serveru
💡 Savet: Ovaj model možeš videti svugde - mobilne aplikacije, online igre, sve radi na klijent-server principu!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Most popular content in Informatika
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user