{"id":5408,"date":"2021-03-29T12:23:20","date_gmt":"2021-03-29T06:53:20","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=5408"},"modified":"2021-03-29T23:03:26","modified_gmt":"2021-03-29T17:33:26","slug":"set-cookie-response-header","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/set-cookie-response-header\/","title":{"rendered":"Understanding Set-Cookie Response Header"},"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-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/set-cookie-response-header\/#Overview_of_Set-Cookie_Response_Header\" title=\"Overview of Set-Cookie Response Header\">Overview of Set-Cookie Response Header<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/set-cookie-response-header\/#Examples\" title=\"Examples\">Examples<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/golangbyexamples.com\/set-cookie-response-header\/#Program\" title=\"Program\">Program<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"has-luminous-vivid-orange-color has-text-color wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview_of_Set-Cookie_Response_Header\"><\/span><strong>Overview of Set-Cookie Response Header<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">The web server can send the Set-Cookie header back to the client or browsers or any other user agent. The client is then supposed to store this cookie at its end. This client will send this cookie to the server on each request.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">You can read about HTTP cookie in general here &#8211; <a href=\"https:\/\/en.wikipedia.org\/wiki\/HTTP_cookie\">https:\/\/en.wikipedia.org\/wiki\/HTTP_cookie<\/a><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Below is the syntax of the Set-Cookie header<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Set-Cookie: <cookie_name>=<cookie_value>; Expires={some_date}; Max-Age={some_integer}; Domain={some_domain}; Path={some_path}; \nSameSite={Strict\/Lax\/None}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Below are the fields of the Set-Cookie header. These fields are joined by\u00a0<strong>&#8216;;&#8217;<\/strong> to create the final Set-Cookie header value<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>name=value<\/strong> &#8211; This is the name-value pair that denotes the &lt;cookie-name> and &lt;cookie-value>. Name and Value separated by <strong>&#8216;=&#8217;<\/strong>.\u00a0 This is a mandatory field of a cookie. All other fields are optional fields<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>Expires={some_date}<\/strong> &#8211; It specifies the max lifetime of a cookie. It is in date format and the cookie will expire after that.\u00a0<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>Max-Age={some_integer}<\/strong> &#8211; it represents the number of seconds after which the cookie will expire. Max-Age has precedence if both Expires and Max-Date is specified<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>Domain={some_domain}<\/strong> &#8211; It specifies the domain to which the request will be sent<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>Path={some_path}<\/strong> &#8211; The path to exist in the requested URI for the client to send the cookies. If the path does not match the requested URI, the client will not send the cookie. The higher level path matches the lower level path.\u00a0 Hence \/ will match all paths. While \/employee will match \/employee, \/employee\/name, \/employee\/details<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>Secure<\/strong> &#8211; This flag means that cookie will only be sent to the server if an HTTPS request is made<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>HttpOnly<\/strong> &#8211; With this flag on,\u00a0 javascript will not be able to access the cookie. This is to prevent CSRF attacks<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>SameSite<\/strong>=<strong>Strict<\/strong> or <strong>Lax<\/strong> or <strong>None<\/strong> &#8211; This option controls whether the cookies can be sent when the browser makes a cross-origin call.\u00a0<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">As mentioned above these fields can be combined using\u00a0<strong>&#8216;;&#8217;<\/strong> to create the final Set-Cookie header.\u00a0 An important thing to note here is that the client will only send the name-value pair back to the server for subsequent calls to the server. All other options are for client only. Other important point to note is that server can also send multiple <strong>Set-Cookie<\/strong> header in the response. All the name-value pair in all the Set-Cookie response header will be send to the server in subsequent calls.<\/p>\n\n\n\n<h1 class=\"has-luminous-vivid-orange-color has-text-color wp-block-heading\"><span class=\"ez-toc-section\" id=\"Examples\"><\/span><strong>Examples<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">Here are some samples of Set-Cookie header<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Only name-value pair<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">show_pop=true<\/code><\/pre>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>name-value pair with Expires field<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">show_pop=true; Expires=Tues, 27 Nov 2016 07:45:00 GMT<\/code><\/pre>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>name-value pair with other fields<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">show_pop=true; Expires=Tues, 27 Nov 2016 07:45:00 GMT; Domain=foo_test.com; SameSite=Strict<\/code><\/pre>\n\n\n\n<h1 class=\"has-luminous-vivid-orange-color has-text-color wp-block-heading\"><span class=\"ez-toc-section\" id=\"Program\"><\/span><strong>Program<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">Let&#8217;s see the <strong>Set-Cookie<\/strong> header in action.\u00a0 We will see the example in golang. For that first create a golang server listening on port 8080. Create two APIs<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>localhost:8080\/doc<\/strong> &#8211; In this API the server will set the <strong>Set-Cookie<\/strong> header in the response. We are going to make this call from the browser. The browser is going to save this cookie at its end. The browser will then send the same cookie back to the server for any other request to localhost:8080<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>localhost:8080\/doc\/id<\/strong> &#8211; This is the example API to demonstrate that browser actually sends the same cookie in request which in received in response in the Set-Cookie header<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">Let&#8217;s first create a server<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>go.mod<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">module sample.com\/learn\n\ngo 1.16<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>main.go<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport (\n\t\"fmt\"\n\t\"net\/http\"\n)\n\nfunc main() {\n\tdocHandler := http.HandlerFunc(docHandler)\n\thttp.Handle(\"\/doc\", docHandler)\n\n\tdocGetID := http.HandlerFunc(docGetID)\n\thttp.Handle(\"\/doc\/id\", docGetID)\n\n\thttp.ListenAndServe(\":8080\", nil)\n}\n\nfunc docHandler(w http.ResponseWriter, r *http.Request) {\n\tcookie := &http.Cookie{\n\t\tName:   \"id\",\n\t\tValue:  \"abcd\",\n\t\tMaxAge: 300,\n\t}\n\thttp.SetCookie(w, cookie)\n\tw.WriteHeader(200)\n\tw.Write([]byte(\"Doc Get Successful\"))\n\treturn\n}\n\nfunc docGetID(w http.ResponseWriter, r *http.Request) {\n\tc, _ := r.Cookie(\"id\")\n\tfmt.Println(c)\n\tw.WriteHeader(200)\n\tw.Write([]byte(\"Doc Get ID Successful\"))\n\treturn\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">See in the above code we have two APIs as discussed above. Run the above program using<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">go run main.go<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">The server will start running\u00a0 on port 8080<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Now make the API call <strong>localhost:8080\/doc<\/strong> from a browser. The server is sending below <strong>Set-Cookie<\/strong> in the response<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Set-Cookie: id=abcd; Max-Age=300<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Same is also visible in the response headers of the API call. See screenshot below<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"791\" src=\"https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_1-828x1024.png?resize=640%2C791&#038;ssl=1\" alt=\"cookie_set_request\" class=\"wp-image-5409\" srcset=\"https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_1.png?resize=828%2C1024&amp;ssl=1 828w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_1.png?resize=243%2C300&amp;ssl=1 243w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_1.png?resize=768%2C949&amp;ssl=1 768w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_1.png?resize=1243%2C1536&amp;ssl=1 1243w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_1.png?resize=300%2C371&amp;ssl=1 300w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_1.png?resize=850%2C1051&amp;ssl=1 850w, https:\/\/i0.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_1.png?w=1288&amp;ssl=1 1288w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" data-recalc-dims=\"1\" \/><\/figure>\n\n\n\n<p class=\"has-medium-font-size\">Now let&#8217;s make the other API call from a different tab.\u00a0 Notice that same cookie is send back in the response. Also note that only name-value pair is send back as we mentioned above in the article<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"731\" src=\"https:\/\/i1.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_2-897x1024.png?resize=640%2C731&#038;ssl=1\" alt=\"cookie_send_request\" class=\"wp-image-5410\" srcset=\"https:\/\/i2.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_2.png?resize=897%2C1024&amp;ssl=1 897w, https:\/\/i2.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_2.png?resize=263%2C300&amp;ssl=1 263w, https:\/\/i2.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_2.png?resize=768%2C876&amp;ssl=1 768w, https:\/\/i2.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_2.png?resize=1346%2C1536&amp;ssl=1 1346w, https:\/\/i2.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_2.png?resize=300%2C342&amp;ssl=1 300w, https:\/\/i2.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_2.png?resize=850%2C970&amp;ssl=1 850w, https:\/\/i2.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_2.png?w=1362&amp;ssl=1 1362w, https:\/\/i2.wp.com\/golangbyexamples.com\/wp-content\/uploads\/2021\/03\/set_cookie_2.png?w=1280&amp;ssl=1 1280w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" data-recalc-dims=\"1\" \/><\/figure>\n\n\n\n<p class=\"has-medium-font-size\">Checkout our Golang comprehensive tutorial Series &#8211; <a href=\"https:\/\/golangbyexamples.com\/golang-comprehensive-tutorial\/\">Golang Comprehensive Tutorial<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents Overview of Set-Cookie Response HeaderExamplesProgram Overview of Set-Cookie Response Header The web server can send the Set-Cookie header back to the client or browsers or any other user agent&#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":[],"class_list":["post-5408","post","type-post","status-publish","format-standard","hentry","category-tech"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - 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