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:
- Response must have one status-line.
- Response can have zero, one, or many header lines.
- Response can only have zero or one entity-body.
- There is a blank line between header lines and the entity body.
- Status line, header line, and blank line must be ended with CRLF ("/r/n") characters.
- Entity body is the actual data requested by the client request.
- Header lines can be in any order.
Below is a sample HTTP response with two header lines:
HTTP/1.1 200 OK
Last update: 2019.
Table of Contents
About This Book
Introduction and Installation of PHP 7.3
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
Introduction of Class and Object
Integrating PHP with Apache Web Server
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
Configuring and Sending out Emails
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