## The Cookie Processor Component

### Table of Contents

- Introduction
- Attributes
  1. Common Attributes
  2. Standard Implementation
- Nested Components
- Special Features

### Introduction

The CookieProcessor element represents the component that parses received cookie headers into `jakarta.servlet.http.Cookie` objects accessible through `HttpServletRequest.getCookies()` and converts `jakarta.servlet.http.Cookie` objects added to the response through `HttpServletResponse.addCookie()` to the HTTP headers returned to the client.

A CookieProcessor element MAY be nested inside a Context component. If it is not included, a default implementation will be created automatically.

### Attributes

#### Common Attributes

All implementations of CookieProcessor support the following attributes:

Attribute | Description
--- | ---
`className` | Java class name of the implementation to use. This class must implement the `org.apache.tomcat.util.http.CookieProcessor` interface. If not specified, the standard value (defined below) will be used.

#### Standard Implementation

The standard implementation of CookieProcessor is `org.apache.tomcat.util.http.Rfc6265CookieProcessor`.

This cookie processor is based on RFC6265 with the following changes to support better interoperability:

- Values 0x80 to 0xFF are permitted in cookie-octet to support the use of UTF-8 in cookie values as used by HTML 5.
- For cookies without a value, the '=' is not required after the name as some browsers do not sent it.

The RFC 6265 cookie processor is generally more lenient than the legacy cookie parser. In particular:

- The '`=`' and '`/`' characters are always permitted in a cookie value.
- Name only cookies are always permitted.
- The cookie header is always preserved.

The RFC 6265 Cookie Processor supports the following additional attributes.

Attribute | Description
--- | ---
`sameSiteCookies` | Enables setting same-site cookie attribute. If value is `unset` then the same-site cookie attribute won't be set. This is the default value. If value is `none` then the same-site cookie attribute will be set and the cookie will always be sent in cross-site requests. If value is `lax` then the browser only sends the cookie in same-site requests and cross-site top level GET requests. If value is `strict` then the browser prevents sending the cookie in any cross-site request.

### Nested Components

No element may be nested inside a CookieProcessor.

### Special Features

No special features are associated with a CookieProcessor element.