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# XXXVII. HTTP functions

# Introduction

These functions let you manipulate the output sent back to the remote browser right down to the HTTP protocol level.

# Requirements

No external libraries are needed to build this extension.

# Installation

There is no installation needed to use these functions; they are part of the PHP core.

# Runtime Configuration

This extension has no configuration directives defined in `php.ini`.

# Resource Types

This extension has no resource types defined.

# Predefined Constants

This extension has no constants defined.

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