{"id":4731,"date":"2020-12-18T00:57:11","date_gmt":"2020-12-17T19:27:11","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=4731"},"modified":"2020-12-18T11:38:05","modified_gmt":"2020-12-18T06:08:05","slug":"user-agent-http-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/user-agent-http-golang\/","title":{"rendered":"Get client&#8217;s user agent from an incoming HTTP request 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-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/user-agent-http-golang\/#Overview\" title=\"Overview\">Overview<\/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\/user-agent-http-golang\/#Example\" title=\"Example\">Example<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Overview\"><\/span><strong>Overview<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">User-agent in an incoming HTTP request is present in the headers of the request. In Go an incoming HTTP request is represented by the <strong>http.Request<\/strong> struct<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><a href=\"https:\/\/golang.org\/src\/net\/http\/request.go\">https:\/\/golang.org\/src\/net\/http\/request.go<\/a><\/p>\n\n\n\n<p class=\"has-medium-font-size\">The <strong>http.Request<\/strong> struct exposes the below method for getting the user-agent of the request<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">func (r *Request) UserAgent() string<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">This method needs to be called on the request object.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Example\"><\/span><strong>Example<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">Let&#8217;s see 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\"fmt\"\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\n\tuserAgent := r.UserAgent()\n\tfmt.Printf(\"UserAgent:: %s\", userAgent)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Run the above program and make the below API call. Also pass in the user-agent header<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">curl -v -X POST http:\/\/localhost:8080\/example -H \"user-agent: Mozialla -1.0\"<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">UserAgent:: Mozialla -1.0<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">In the above program, we are calling the <strong>UesrAgent()<\/strong> function on the request struct object and then printing it. It correctly prints the user agent<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Contents OverviewExample Overview User-agent in an incoming HTTP request is present in the headers of the request. In Go an incoming HTTP request is represented by the http.Request struct https:\/\/golang.org\/src\/net\/http\/request.go&#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":[3,4],"class_list":["post-4731","post","type-post","status-publish","format-standard","hentry","category-tech","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>Get client&#039;s user agent from an incoming HTTP request in Go (Golang) - Welcome To Golang By Example<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/golangbyexamples.com\/user-agent-http-golang\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Get client&#039;s user agent from an incoming HTTP request in Go (Golang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Table of Contents OverviewExample Overview User-agent in an incoming HTTP request is present in the headers of the request. 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