The 5 Best Communication Protocols of 2025!

Krishi Shivasangaran Published On November 11th, 2024 Tech Talks

In this digital era, communication is rapidly increasing, getting faster and convenient for people across the globe. From sending messages over letters to today’s digital direct messaging, communication has evolved to fit right within our palms. But how do we know these systems are reliable and safe to use? This is where Communication Protocols steps in.

In this article ahead, we will discuss about, 

• What communication protocols are all about.
• Their pros and cons.
• And finally, discover which one will best suit your needs. 

So, let’s jump-start right away! 

What are Communication Protocols?

A communications protocol is a set of instructions on how to send or share data between devices that are connected over a network. These rules cover how the data in an app should be structured, what it means, when to send it and how to fix issues when they occur. 

 

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Why are Communication Protocols Important For Your Business Apps?

Do you own a business app or are interested in developing one with interaction features? Then you might want to consider getting to know the basics of communication protocols. These protocols define how the information exchange happens between user devices via your app. You’ll need to ensure that these protocols are set up right to stay confident about the security and smooth technical functionalities. 

5 Most Popular Communication Protocols in 2025

1. HTTP/1

Hypertext Transfer Protocol, or HTTP / 1.1, is an application protocol that exchanges data between user devices and your app server. This protocol was developed by Timothy Berners-Lee in 1989.

How Does It Work?

When you set up this protocol, the data exchange between user device and your server happens as follows:

• Step 1: The user device (client) sends a text based request to your server.
• Step 2: When the server receives this request, it will start loading the response as a set of resources. 
• Step 3: The response one after another and traverse to the client device. 
• Step 4: The response reached the client in the form of an HTML page. 

Note: The resources cannot be loaded all at once. Which means, if one of these resources cannot be loaded, it will block all other resources lined up behind. 

Interestingly, this data exchange happens in two way with HTTP 1.1:

i. Short Polling

• During short polling, the user device (client) sends multiple requests until your server responds with new data. 
• After receiving this response, it starts with new requests to get the next new data. This process keeps repeating continuously.
• This type of polling is considered as an ineffective data transfer method as a lot of resources and time is wasted during the parsing of requests and responses. 

ii. Long Polling

• In long polling, when a client device makes a request, your server will keep the connection with the device open. 
• It does not terminate the connection until new data is available. 
• After the client receives this response, it initiates a new request, and the server opens a new connection to handle this new request.

Thus, considering real-time connection for apps- neither short polling nor long polling sound efficient for effective real-time connection requirements. So it’s time to look into its successor – HTTP/2

2. HTTP/2

HTTP/2 is more or less an enhanced version of the HTTP protocol. It discards all the limitations in HTTP, without any change in the semantics. Since this protocol allows only one persistent connection for multiple requests, it is considered more effective in utilizing the resources resulting in improved performance and speed. 

How Does It Work?

HTTP/ 2 uses the framing mechanism to exchange data between the client and server. 

Unlike HTTP/1, this protocol uses only 1 connection for the entire data exchange process and handles the request and response in two ways:

1. HTTP/2 Multiple Stream

• Step 1: When a request is initiated, a TCP connection opens
• Step 2: The data starts following as a stream without getting blocked at any point
• Step 3: The TCP connection closes only when the request is completely fulfilled

2. HTTP/2 Multiplexing Stream

• Step 1: The client and server breaks down the HTTP message into individual frames at the binary framing layer. 
• Step 2: These frames are interleaved and reassembled 
• Step 3: Finally, these reassembled message reaches its respective endpoints

3. WebSockets

Websockets are full-duplex, bi-directional protocols that establish connection between client and server via a single open connection. With websockets, connection happens bi-directionally, making data transfer capable for real-time communications.

How does it work?

In a Websocket connection, a normal HTTP/1.1 protocol is used to make the first handshake between the client and the server. This handshake bridges the HTTP and Websocket protocols.

Here is how this connection is established:

The Request:

Connection: Upgrade Header represents the Websocket Handshake

Sec-WebSocket-Key represents a random value with Base64-encoded. For every handshake, this value is generated. Apart from these, the request also contains a key header 

When these headers are combine, the HTTP GET request look something like this:

GET ws://websocketexample.com:8181/ HTTP/1.1
Host: localhost:8181
Connection: Upgrade
Pragma: no-cache
Cache-Control: no-cache
Upgrade: websocket
Sec-WebSocket-Version: 13
Sec-WebSocket-Key: b6gjhT32u488lpuRwKaOWs==

The Response:

Sec-WebSocket-Accept is the response header that represents the submitted value in Sec-WebSocket-Key request. These headers are connected with unique protocols in order to avoid API security risks. 

On a successful request, the response will look similar to the below sequence:

HTTP/1.1 101 Switching Protocol
sUpgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: rG8wsswmHTJ85lJgAE3M5RTmcCE=

4. gRPC

gRPC (Remote Procedure Call) is an open-source framework initially developed by Google. It simplifies complex networking infrastructures by connecting services with pluggable supports. 

Above all, gRPC can create cross-platform binding between clients and servers. It allows client apps to directly call methods that run on a server app installed in a different machine. 

How Does It Work?

gRPC creates a protocol buffer compiler right from service definition to generate client- and server-side code. The protocol is used to call the APIs on the client side. In retrospect, the implementation of the APIs take place on the server side. 

Server Side:

• Step 1: The Service declares the methods
• Step 2: The server implements these methods and handles the client calls using gRPC
• Step 3: gRPCs decodes the incoming requests
• Step 4: Runs the service methods 
• Step 5: Encode the service responses

Client Side:

• Step 1: Similar to the service on the server side, the client side uses stub, a local object to declare the methods.
• Step 2: The client implements these methods and handles the calls with the right protocol buffer message type
• Step 3: Meanwhile, gRPC takes care of the server requests and the buffer responses of the server protocol.

5. WebRTCs

WebRTC is an open source protocol that supports exchange of text, voice, video, or any generic data between user devices in real-time. The foremost advantage of using Websockets is that it is an open standard that does not require a server to establish communication between peers. Consequently, it immensely reduces the latency when any form of communication takes place. 

How does it work?

Step 1: Signaling 

This process sets up and controls the entire communication session. Signaling is where the real-time data is sent to the server for encoding and then delivered to the peer. 

Step: 2 Connection

Next, two or more peer devices need to be connected. This step involved ICE servers, which generate unique agents for each candidate (transport address). Using these candidates, the STUN and TURN servers connect the peers, wherever they are located. 

Step 3: Security Implementation

WebRTCs use Datagram Transport Layer Security (DTLS) and Secure Real-time Transport Protocol (SRTP) to encrypt and secure user data.

Step 4: Communication

When you implement WebRTCs, you will have to establish unlimited data transfer between user devices. Be it voice, video or large media files, the communication needs to be right on time. Hence, WebRTCs use the Real-time Transport Protocol (RTC) and Real-time Control Protocol (RTCP) protocol for live data transfer. 

When Should You Use These Protocols?

The use case of these protocols largely differ from each other. However, you may need to choose the protocol that rightly fits your requirement. So, here is a quick checklist for your reference:

HTTP

• To establish bidirectional communication 
• When you need to use gRPC or WebSockets

WebSockets

• For real-time applications
• Small amount of data transfer

gRPC

• Suited for large data transfer and small API calls
• When implementing microservices with different programming languages 

WebRTC

• Real-time communication
• Low latency
• Large data transfer
• Direct use on browser

Conclusion

Made the right pick? We hope this article has done a fair job in helping you analyze the best communication protocol for your apps. Several other protocols are on the rise and stay in touch with us to get interesting updates on them. 

And we don’t stop here. As a team of tech enthusiasts, we’d love to cover more about the topics you wish to delve into. Post in a comment and we’ll take care of the research. Until then, happy development! 

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Frequently Asked Questions (FAQ)

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Further Reading

• Top 10 Best Group Video Call Apps For 2025

• Best Programming Languages For Chat, Voice, and Video App Development in 2025

• Angular Vs React: Which One is Best for Your App?

• NextJS vs ExpressJS: Which JavaScript Framework To Choose?

• WebRTC vs WebSockets – Which One is Right for Your Application?