{"id":5526,"date":"2021-04-28T10:28:04","date_gmt":"2021-04-28T04:58:04","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=5526"},"modified":"2021-04-28T10:29:53","modified_gmt":"2021-04-28T04:59:53","slug":"read-cookie-http-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/read-cookie-http-golang\/","title":{"rendered":"Read cookie http in Go (Golang)"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/read-cookie-http-golang\/#Overview\" title=\"Overview\">Overview<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/read-cookie-http-golang\/#Program\" title=\"Program\">Program<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"has-luminous-vivid-orange-color has-text-color has-large-font-size wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview\"><\/span><strong>Overview<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">net\/http Request struct provides a convenient method to read a particular cookie given its name. Below is the signature of that method.\u00a0<a href=\"https:\/\/golang.org\/pkg\/net\/http\/#Request.Cookie\">https:\/\/golang.org\/pkg\/net\/http\/#Request.Cookie<\/a><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">func (r *Request) Cookie(name string) (*Cookie, error)<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">To print all cookies,\u00a0 we can iterate over the <strong>Cookies<\/strong> method of <strong>http.Request<\/strong> struct. We can use a range keyword for that.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">for _, c := range r.Cookies() {\n     fmt.Println(c)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Both these functions will return the instance of the <strong>Cookie<\/strong> struct. A cookie in golang is represented as below in golang.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><a href=\"https:\/\/golang.org\/src\/net\/http\/cookie.go\">https:\/\/golang.org\/src\/net\/http\/cookie.go<\/a><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">type Cookie struct {\n\tName  string\n\tValue string\n\n\tPath       string    \/\/ optional\n\tDomain     string    \/\/ optional\n\tExpires    time.Time \/\/ optional\n\tRawExpires string    \/\/ for reading cookies only\n\n\t\/\/ MaxAge=0 means no 'Max-Age' attribute specified.\n\t\/\/ MaxAge<0 means delete cookie now, equivalently 'Max-Age: 0'\n\t\/\/ MaxAge>0 means Max-Age attribute present and given in seconds\n\tMaxAge   int\n\tSecure   bool\n\tHttpOnly bool\n\tSameSite SameSite\n\tRaw      string\n\tUnparsed []string \/\/ Raw text of unparsed attribute-value pairs\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">See <a href=\"https:\/\/tools.ietf.org\/html\/rfc6265\">https:\/\/tools.ietf.org\/html\/rfc6265<\/a> for details of each of the fields of the above cookie.<\/p>\n\n\n\n<h2 class=\"has-luminous-vivid-orange-color has-text-color has-large-font-size wp-block-heading\"><span class=\"ez-toc-section\" id=\"Program\"><\/span><strong>Program<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">Below is the program for the same to illustrate the <strong>Cookie<\/strong> and <strong>Cookies<\/strong> method of the <strong>http.Request<\/strong> struct<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport (\n\t\"fmt\"\n\t\"log\"\n\t\"net\/http\"\n)\n\nfunc main() {\n\tdocHandler := http.HandlerFunc(docHandler)\n\thttp.Handle(\"\/doc\", docHandler)\n\n\thttp.ListenAndServe(\":8080\", nil)\n}\n\nfunc docHandler(w http.ResponseWriter, r *http.Request) {\n\tfmt.Println(\"Cookies in API Call:\")\n\n\ttokenCookie, err := r.Cookie(\"token\")\n\tif err != nil {\n\t\tlog.Fatalf(\"Error occured while reading cookie\")\n\t}\n\tfmt.Println(\"\\nPrinting cookie with name as token\")\n\tfmt.Println(tokenCookie)\n\n\tfmt.Println(\"\\nPrinting all cookies\")\n\tfor _, c := range r.Cookies() {\n\t\tfmt.Println(c)\n\t}\n\tfmt.Println()\n\tw.WriteHeader(200)\n\tw.Write([]byte(\"Doc Get Successful\"))\n\treturn\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Run the program above and make the below curl call<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">curl -X GET localhost:8080\/doc --cookie \"id=abcd; token=some_token\"<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">The curl call is passing two cookie name-value pairs<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>id=abcd<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>token=some_token<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">It will give below output<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Cookies in API Call:\n\nPrinting cookie with name as \"token\"\ntoken=some_token\n\nPrinting all cookies\nid=abcd\ntoken=some_token<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">This is how we print a particular cookie with a given name <strong>&#8220;token&#8221;<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">tokenCookie, err := r.Cookie(\"token\")<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">It prints as seen from the output<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">token=some_token<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">This is how we print all the cookies<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">for _, c := range r.Cookies() {\n     fmt.Println(c)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">It outputs both the cookies name-value pairs that we had sent in the curl call<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">id=abcd\ntoken=some_token<\/code><\/pre>\n\n\n\n<p style=\"font-size:24px\">That was all about cookies in golang. Hope you have liked the tutorial. Please share feedback in the comments.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Also, check out our Golang advance tutorial Series &#8211; <a href=\"https:\/\/golangbyexamples.com\/golang-comprehensive-tutorial\/\">Golang Advance Tutorial<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewProgram Overview net\/http Request struct provides a convenient method to read a particular cookie given its name. Below is the signature of that method.\u00a0https:\/\/golang.org\/pkg\/net\/http\/#Request.Cookie To print all cookies,\u00a0 we&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[316,3,4],"class_list":["post-5526","post","type-post","status-publish","format-standard","hentry","category-tech","tag-cookie","tag-go","tag-golang"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Read cookie http in Go (Golang) - Welcome To Golang By Example<\/title>\n<meta name=\"description\" content=\"This tutorial is about how we can read cookies in golang. 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