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November 21st 2018
Last Modified


– import “”

Package cookiejar implements an in-memory RFC 6265-compliant http.CookieJar.

This implementation is a fork of net/http/cookiejar which also implements methods for dumping the cookies to persistent storage and retrieving them.


func DefaultCookieFile

func DefaultCookieFile() string

DefaultCookieFile returns the default cookie file to use for persisting cookie data. The following names will be used in decending order of preference:

- the value of the $GOCOOKIES environment variable.
- $HOME/.go-cookies

type Jar

type Jar struct {

Jar implements the http.CookieJar interface from the net/http package.

func New

func New(o *Options) (*Jar, error)

New returns a new cookie jar. A nil *Options is equivalent to a zero Options.

New will return an error if the cookies could not be loaded from the file for any reason than if the file does not exist.

func (*Jar) Cookies

func (j *Jar) Cookies(u *url.URL) (cookies []*http.Cookie)

Cookies implements the Cookies method of the http.CookieJar interface.

It returns an empty slice if the URL’s scheme is not HTTP or HTTPS.

func (*Jar) Save

func (j *Jar) Save() error

Save saves the cookies to the persistent cookie file. Before the file is written, it reads any cookies that have been stored from it and merges them into j.

func (*Jar) SetCookies

func (j *Jar) SetCookies(u *url.URL, cookies []*http.Cookie)

SetCookies implements the SetCookies method of the http.CookieJar interface.

It does nothing if the URL’s scheme is not HTTP or HTTPS.

type Options

type Options struct {
	// PublicSuffixList is the public suffix list that determines whether
	// an HTTP server can set a cookie for a domain.
	// If this is nil, the public suffix list implementation in
	// is used.
	PublicSuffixList PublicSuffixList

	// Filename holds the file to use for storage of the cookies.
	// If it is empty, the value of DefaultCookieFile will be used.
	Filename string

Options are the options for creating a new Jar.

type PublicSuffixList

type PublicSuffixList interface {
	// PublicSuffix returns the public suffix of domain.
	// TODO: specify which of the caller and callee is responsible for IP
	// addresses, for leading and trailing dots, for case sensitivity, and
	// for IDN/Punycode.
	PublicSuffix(domain string) string

	// String returns a description of the source of this public suffix
	// list. The description will typically contain something like a time
	// stamp or version number.
	String() string

PublicSuffixList provides the public suffix of a domain. For example:

- the public suffix of "" is "com",
- the public suffix of "" is "", and
- the public suffix of "" is "".

Implementations of PublicSuffixList must be safe for concurrent use by multiple goroutines.

An implementation that always returns “” is valid and may be useful for testing but it is not secure: it means that the HTTP server for can set a cookie for

A public suffix list implementation is in the package