{"id":5888,"date":"2021-07-10T13:56:08","date_gmt":"2021-07-10T08:26:08","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=5888"},"modified":"2021-07-10T16:50:14","modified_gmt":"2021-07-10T11:20:14","slug":"401-http-status-response-go","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/401-http-status-response-go\/","title":{"rendered":"Return 401 (UnAuthorized) Status Code in HTTP response 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\/401-http-status-response-go\/#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\/401-http-status-response-go\/#Program\" title=\"Program\">Program<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"has-luminous-vivid-orange-color has-text-color 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\"><strong>net\/http<\/strong> package of golang provides the status code constants which could be used to return different status codes- <a href=\"https:\/\/golang.org\/src\/net\/http\/status.go\">https:\/\/golang.org\/src\/net\/http\/status.go<\/a><\/p>\n\n\n\n<p class=\"has-medium-font-size\">The same can also be used to return the 401 (Unauthorized) HTTP status code.&nbsp; The HTTP 401 status code is defined by the below constant<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">http.StatusUnauthorized<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">In this article, we will also see how to return a JSON body along with the 401 (Unauthorized) Status Code<\/p>\n\n\n\n<h2 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><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">Below is the program for the same<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport (\n\t\"encoding\/json\"\n\t\"log\"\n\t\"net\/http\"\n)\n\nfunc main() {\n\thandler := http.HandlerFunc(handleRequest)\n\thttp.Handle(\"\/example\", handler)\n\thttp.ListenAndServe(\":8080\", nil)\n}\n\nfunc handleRequest(w http.ResponseWriter, r *http.Request) {\n\tw.WriteHeader(http.StatusUnauthorized)\n\tw.Header().Set(\"Content-Type\", \"application\/json\")\n\tresp := make(map[string]string)\n\tresp[\"message\"] = \"Unauthorized\"\n\tjsonResp, err := json.Marshal(resp)\n\tif err != nil {\n\t\tlog.Fatalf(\"Error happened in JSON marshal. Err: %s\", err)\n\t}\n\tw.Write(jsonResp)\n\treturn\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Here we are using the <strong>WriteHeader<\/strong> function to specify the 401 http status code and uses the <strong>Write<\/strong> function to also return the response bodyThe above code returns the below JSON request body back in response<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">{\"message\":\"Unauthorized\"}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Run the above program. It will start a server on 8080 port on your local machine. Now make the below curl call to the server<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">curl -v -X POST http:\/\/localhost:8080\/example<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Below will be the output<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">* Connected to localhost (::1) port 8080 (#0)\n> POST \/example HTTP\/1.1\n> Host: localhost:8080\n> User-Agent: curl\/7.54.0\n> Accept: *\/*\n> \n< HTTP\/1.1 401 Unauthorized\n< Date: Sat, 10 Jul 2021 08:19:52 GMT\n< Content-Length: 26\n< Content-Type: text\/plain; charset=utf-8\n< \n* Connection #0 to host localhost left intact\n{\"message\":\"Unauthorized\"}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">As you can see from the output, it will correctly return the <strong>401<\/strong> status code along with the body.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">You can also directly pass 401 to the WriteHeader function to send the 401 response.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">w.WriteHeader(401)<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">This also works correctly. Try it out.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Also, check out our Golang advance tutorial Series - <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 package of golang provides the status code constants which could be used to return different status codes- https:\/\/golang.org\/src\/net\/http\/status.go The same can also be used to return&#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":[332,3,4],"class_list":["post-5888","post","type-post","status-publish","format-standard","hentry","category-tech","tag-332","tag-go","tag-golang"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - 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