{"id":4708,"date":"2020-12-14T23:02:28","date_gmt":"2020-12-14T17:32:28","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=4708"},"modified":"2020-12-14T23:05:07","modified_gmt":"2020-12-14T17:35:07","slug":"get-response-headers-making-go","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/get-response-headers-making-go\/","title":{"rendered":"Get response headers for an outgoing HTTP request in Go (Golang)"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">Note: Related Post<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Get request headers from an incoming HTTP request in Golang \u2013&nbsp;<a href=\"https:\/\/golangbyexamples.com\/headers-http-request-golang\/\">https:\/\/golangbyexamples.com\/headers-http-request-golang\/<\/a><\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Set response headers for an incoming HTTP request in Golang \u2013&nbsp;<a href=\"https:\/\/golangbyexamples.com\/set-resposne-headers-http-go\/\">https:\/\/golangbyexamples.com\/set-resposne-headers-http-go\/<\/a><\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Set request headers for an outgoing HTTP request in Golang- <a href=\"https:\/\/golangbyexamples.com\/set-headers-http-request\/\">https:\/\/golangbyexamples.com\/set-headers-http-request\/<\/a><\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">Now let\u2019s look at how we can get headers while making an HTTP request<\/p>\n\n\n\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\/get-response-headers-making-go\/#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\/get-response-headers-making-go\/#Using_HeaderValues_method\" title=\"Using Header.Values method\">Using Header.Values method<\/a><ul class=\"ez-toc-list-level-2\"><li class=\"ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/golangbyexamples.com\/get-response-headers-making-go\/#Using_HeaderGet_method\" title=\"Using Header.Get method\">Using Header.Get method<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/golangbyexamples.com\/get-response-headers-making-go\/#Directly_Accessing_the_Header_Struct\" title=\"Directly Accessing the Header Struct\">Directly Accessing the Header Struct<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/golangbyexamples.com\/get-response-headers-making-go\/#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\">Below is the format in which a Header is represented in go.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">type Header map[string][]string<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">So the header is a key value pair with<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>key being represented in canonical form. Canonical form means that the first character and any character following a hyphen is in uppercase. All other characters are in lowercase. Example of canonical forms are<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">Content-Type\nAccept-Encoding<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Value is represented as a slice of string. Why an array of strings? Because it is perfectly okay to two headers with the same key and different values in a request. Both the values will be collected in the slice.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Response in http request is represented by <strong>http.Response<\/strong> struct.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><a href=\"https:\/\/golang.org\/src\/net\/http\/response.go\">https:\/\/golang.org\/src\/net\/http\/response.go<\/a><\/p>\n\n\n\n<p class=\"has-medium-font-size\">There is a <strong>Header<\/strong> field defined in the <strong>http.Response<\/strong> struct as below. It contains the response headers associated with the response<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">type Response interface {\n    Header() Header\n    ...\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">In the below example let&#8217;s assume that variable <strong>w<\/strong> is of type <strong>http.Response<\/strong>. Now let&#8217;s see different ways of getting a response header. Also, assume that we have below response headers for now in an outgoing request<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">User-Agent: application\/json\nFoo: bar1\nFoo: bar2<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Using_HeaderValues_method\"><\/span><strong>Using Header.Values method<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">Used for accessing all values of a header given a key using the Values method. Below is the format of the method<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">func (h Header) Values(key string) []string<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Notice that return type is a slice of string. It will return all the values associated with a given header key. Also the given key is converted to the canonical form first before fetching the values. It can be called as below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">w.Header.Values(key)<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">For eg&nbsp; for<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>w.Header.Values(&#8220;content-type&#8221;)<\/strong> will output <strong>[&#8220;application\/json&#8221; ]<\/strong><\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>w.Header.Values(&#8220;foo&#8221;)<\/strong> will output <strong>[&#8220;bar1&#8221;, &#8220;bar2&#8221;]<\/strong><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Using_HeaderGet_method\"><\/span><strong>Using Header.Get method<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size\">Used for accessing the first value of a header given a key. It is most common method used because generally only single value is associated with a header. Below is the format of the method.<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">func (h Header) Get(key string) string<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Notice that the return type is just a string. It will return the first value associated with the given key. Also, the given key is converted to the canonical form first before fetching the values. It can be called as below<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">w.Header.Get(key)<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">For eg&nbsp; for<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>w.Header.Get(&#8220;content-type&#8221;)<\/strong> it will output <strong>&#8220;application\/json&#8221;<\/strong><\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>w.Header.Get(&#8220;foo&#8221;) <\/strong>will output <strong>&#8220;bar1&#8221;<\/strong>. Only the first value will be returned.<\/li><\/ul>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Directly_Accessing_the_Header_Struct\"><\/span><strong>Directly Accessing the Header Struct<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">Header map can also be directly accessed which is present within *http.Response<\/p>\n\n\n\n<p class=\"has-medium-font-size\">For eg<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>w.Header<\/strong> will output a map<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">map[Accept:[*\/*] Content-Type:[application\/json] Foo:[bar1 bar2]<\/code><\/pre>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>w.Header[&#8220;Content-Type&#8221;] <\/strong>will output<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">[application\/json]<\/code><\/pre>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>w.Header[&#8220;Foo&#8221;] <\/strong>will output<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">[bar1 bar2]<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Please note that when accessing Header map directly, we need to supply the key in canonical form only.<\/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 a program illustrating all the above points<\/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\t\"time\"\n)\n\nfunc main() {\n\tcall(\"https:\/\/google.com\", \"GET\")\n}\n\nfunc call(url, method string) error {\n\tclient := &http.Client{\n\t\tTimeout: time.Second * 10,\n\t}\n\treq, err := http.NewRequest(method, url, nil)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"Got error %s\", err.Error())\n\t}\n\tres, err := client.Do(req)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"Got error %s\", err.Error())\n\t}\n\tdefer res.Body.Close()\n\n\tcontentTypeValues := res.Header.Values(\"content-type\")\n\tfmt.Printf(\"res.Header.Values(\\\"content-type\\\"):: %s\\n\\n\", contentTypeValues)\n\n\tcontentType := res.Header.Get(\"content-type\")\n\tfmt.Printf(\"res.Header.Get(\\\"content-type\\\"):: %s\\n\\n\", contentType)\n\n\theaders := res.Header\n\tfmt.Printf(\"res.Headers:: %s\\n\\n\", headers)\n\tfmt.Printf(\"res.Headers[\\\"Content-Type\\\"]:: %s\\n\\n\", headers[\"Content-Type\"])\n\treturn nil\n\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">After running the above program,&nbsp; check the output in the terminal. It is exactly as we have discussed. Below will be the output<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">res.Header.Values(\"content-type\"):: \n\nres.Header.Get(\"content-type\"):: text\/html; charset=ISO-8859-1\n\nres.Headers:: map[Alt-Svc:[h3-29=\":443\"; ma=2592000,h3-T051=\":443\"; ma=2592000,h3-Q050=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000,quic=\":443\"; ma=2592000; v=\"46,43\"] Cache-Control:[private, max-age=0] Content-Type: Date:[Thu, 10 Dec 2020 16:38:03 GMT] Expires:[-1] P3p:[CP=\"This is not a P3P policy! See g.co\/p3phelp for more info.\"] Server:[gws] Set-Cookie:[1P_JAR=2020-12-10-16; expires=Sat, 09-Jan-2021 16:38:03 GMT; path=\/; domain=.google.com; Secure NID=204=w6zf-xFyVywx7QaClDZuQ5N-Yc-4HqKWBS-JXWp2Tat9kmq0BRsanM35PJHiM2iEn4TbP2HcTUd0KkIuMuIW7xFewD5un2_mc0O4fm2IXzrQyRmPWHJSeQJUUVb0-_lIfJgSnGmJm2MptRsd2egrPsbZJQBZWd97o7KlFBI3CIE; expires=Fri, 11-Jun-2021 16:38:03 GMT; path=\/; domain=.google.com; HttpOnly] X-Frame-Options:[SAMEORIGIN] X-Xss-Protection:[0]]\n\nres.Headers[\"Content-Type\"]:: <\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Notice that<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">res.Header.Values(\"content-type\"):<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">outputs an array<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\"><\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">while<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">res.Header.Get(\"content-type\")<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">outputs<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">text\/html; charset=ISO-8859-1<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">Also<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">res.Headers<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\">outputs the entire header map. Notice that each key is in the canonical format<\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">map[Alt-Svc:[h3-29=\":443\"; ma=2592000,h3-T051=\":443\"; ma=2592000,h3-Q050=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000,quic=\":443\"; ma=2592000; v=\"46,43\"] Cache-Control:[private, max-age=0] Content-Type: Date:[Thu, 10 Dec 2020 16:38:03 GMT] Expires:[-1] P3p:[CP=\"This is not a P3P policy! See g.co\/p3phelp for more info.\"] Server:[gws] Set-Cookie:[1P_JAR=2020-12-10-16; expires=Sat, 09-Jan-2021 16:38:03 GMT; path=\/; domain=.google.com; Secure NID=204=w6zf-xFyVywx7QaClDZuQ5N-Yc-4HqKWBS-JXWp2Tat9kmq0BRsanM35PJHiM2iEn4TbP2HcTUd0KkIuMuIW7xFewD5un2_mc0O4fm2IXzrQyRmPWHJSeQJUUVb0-_lIfJgSnGmJm2MptRsd2egrPsbZJQBZWd97o7KlFBI3CIE; expires=Fri, 11-Jun-2021 16:38:03 GMT; path=\/; domain=.google.com; HttpOnly] X-Frame-Options:[SAMEORIGIN] X-Xss-Protection:[0]]<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Note: Related Post Get request headers from an incoming HTTP request in Golang \u2013&nbsp;https:\/\/golangbyexamples.com\/headers-http-request-golang\/ Set response headers for an incoming HTTP request in Golang \u2013&nbsp;https:\/\/golangbyexamples.com\/set-resposne-headers-http-go\/ Set request headers for an outgoing HTTP&#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":[4],"class_list":["post-4708","post","type-post","status-publish","format-standard","hentry","category-tech","tag-golang"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - 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