What Is an HTTP Response?

This section describes what is an HTTP response - The message returned from a Web server to the client machine in response to an HTTP request from that client machine.

What Is an HTTP Response? A HTTP response is the message a Web server needs to return back to a Web client machine in response to an HTTP request from the same client machine. Based on the HTTP/1.1 protocol, after receiving and interpreting an HTTP request from a client machine, a Web server must responds with an HTTP response message with the following structure:

status-line
header-line
...
header-line

entity-body

Note that:

Below is a sample HTTP response with two header lines:

HTTP/1.1 200 OK
Content-Type: text/html
Content-Length: 38

<html><body>Hello world!</body></html>

Last update: 2015.

Table of Contents

 About This Book

 Introduction and Installation of PHP 7.0

 PHP Script File Syntax

 PHP Data Types and Data Literals

 Variables, References, and Constants

 Expressions, Operations and Type Conversions

 Conditional Statements - "if" and "switch"

 Loop Statements - "while", "for", and "do ... while"

 Function Declaration, Arguments, and Return Values

 Arrays - Ordered Maps

 Configuring and Sending out Emails

 Retrieving Information from HTTP Requests

 Creating and Managing Sessions in PHP Scripts

 Sending and Receiving Cookies in PHP Scripts

Controlling HTTP Response Header Lines in PHP Scripts

What Is an HTTP Response?

 HTTP Response Header Lines

 header() - Inserting a Raw Header Lines

 HttpRequestGet.php - Viewing Header Lines

 Response Header Lines of Static Files

 HttpHeaderLines.php - Examples of Inserting Header Lines

 Location: - Forcing the Browser to Redirect to Another URL

 Content-Type: - Generating Non-HTML Response Body

 Content-Disposition: - Sending Files for Downloading

 MySQL Server Connection and Access Functions

 Functions to Manage Directories, Files and Images

 SOAP Extension Function and Calling Web Services

 SOAP Server Functions and Examples

 Localization Overview of Web Applications

 Using Non-ASCII Characters in HTML Documents

 Using Non-ASCII Characters as PHP Script String Literals

 Receiving Non-ASCII Characters from Input Forms

 "mbstring" Extension and Non-ASCII Encoding Management

 Managing Non-ASCII Character Strings with MySQL Servers

 Introduction of Class and Object

 Integrating PHP with Apache Web Server

 Outdated Tutorials

 References

 PDF Printing Version