{"id":7448,"date":"2024-03-14T21:44:13","date_gmt":"2024-03-14T12:44:13","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/golang%e3%81%a7%e5%a4%a7%e3%81%8d%e3%81%aa%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%ae%e8%bb%a2%e9%80%81%e3%81%a8%e9%80%94%e4%b8%ad%e3%81%a7%e3%81%ae%e7%b6%99%e7%b6%9a%e8%bb%a2%e9%80%81%e3%82%92\/"},"modified":"2025-08-03T14:39:46","modified_gmt":"2025-08-03T05:39:46","slug":"golang%e3%81%a7%e5%a4%a7%e3%81%8d%e3%81%aa%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%ae%e8%bb%a2%e9%80%81%e3%81%a8%e9%80%94%e4%b8%ad%e3%81%a7%e3%81%ae%e7%b6%99%e7%b6%9a%e8%bb%a2%e9%80%81%e3%82%92","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/golang%e3%81%a7%e5%a4%a7%e3%81%8d%e3%81%aa%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%ae%e8%bb%a2%e9%80%81%e3%81%a8%e9%80%94%e4%b8%ad%e3%81%a7%e3%81%ae%e7%b6%99%e7%b6%9a%e8%bb%a2%e9%80%81%e3%82%92\/","title":{"rendered":"Go\u8a00\u8a9e\uff1a\u5927\u5bb9\u91cf\u30d5\u30a1\u30a4\u30eb\u8ee2\u9001\u3068\u4e2d\u65ad\u304b\u3089\u306e\u518d\u958b\u3010\u5b9f\u88c5\u30ac\u30a4\u30c9\u3011"},"content":{"rendered":"<p>\u30b4\u30fc\u30e9\u30f3\u30b0\u3067\u306f\u3001\u5927\u5bb9\u91cf\u30d5\u30a1\u30a4\u30eb\u306e\u8ee2\u9001\u3084\u4e00\u6642\u505c\u6b62\u3057\u305f\u7b87\u6240\u304b\u3089\u306e\u7d99\u7d9a\u8ee2\u9001\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306bHTTP\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">package<\/span> main\r\n\r\n<span class=\"hljs-keyword\">import<\/span> (\r\n\t<span class=\"hljs-string\">\"fmt\"<\/span>\r\n\t<span class=\"hljs-string\">\"io\"<\/span>\r\n\t<span class=\"hljs-string\">\"net\/http\"<\/span>\r\n\t<span class=\"hljs-string\">\"os\"<\/span>\r\n\t<span class=\"hljs-string\">\"strconv\"<\/span>\r\n)\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">handler<\/span><span class=\"hljs-params\">(w http.ResponseWriter, r *http.Request)<\/span><\/span> {\r\n\tfile, err := os.Open(<span class=\"hljs-string\">\"large_file.txt\"<\/span>)\r\n\t<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\n\t\tfmt.Println(<span class=\"hljs-string\">\"Error opening file: \"<\/span>, err)\r\n\t\t<span class=\"hljs-keyword\">return<\/span>\r\n\t}\r\n\t<span class=\"hljs-keyword\">defer<\/span> file.Close()\r\n\r\n\tfileInfo, err := file.Stat()\r\n\t<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\n\t\tfmt.Println(<span class=\"hljs-string\">\"Error getting file info: \"<\/span>, err)\r\n\t\t<span class=\"hljs-keyword\">return<\/span>\r\n\t}\r\n\r\n\tw.Header().Set(<span class=\"hljs-string\">\"Content-Disposition\"<\/span>, <span class=\"hljs-string\">\"attachment; filename=large_file.txt\"<\/span>)\r\n\tw.Header().Set(<span class=\"hljs-string\">\"Content-Type\"<\/span>, <span class=\"hljs-string\">\"application\/octet-stream\"<\/span>)\r\n\tw.Header().Set(<span class=\"hljs-string\">\"Content-Length\"<\/span>, strconv.FormatInt(fileInfo.Size(), <span class=\"hljs-number\">10<\/span>))\r\n\r\n\thttp.ServeContent(w, r, <span class=\"hljs-string\">\"large_file.txt\"<\/span>, fileInfo.ModTime(), file)\r\n}\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span><\/span> {\r\n\thttp.HandleFunc(<span class=\"hljs-string\">\"\/\"<\/span>, handler)\r\n\thttp.ListenAndServe(<span class=\"hljs-string\">\":8080\"<\/span>, <span class=\"hljs-literal\">nil<\/span>)\r\n}\r\n<\/code><\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u6700\u521d\u306blarge_file.txt\u3068\u3044\u3046\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304d\u3001HTTP\u30ec\u30b9\u30dd\u30f3\u30b9\u30d8\u30c3\u30c0\u3092\u8a2d\u5b9a\u3057\u3001\u305d\u306e\u5f8c\u3001http.ServeContent\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306e\u5185\u5bb9\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u9001\u4fe1\u3057\u307e\u3057\u305f\u3002 \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306fhttp:\/\/localhost:8080\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3053\u306e\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u65ad\u70b9\u7eed\u4f20\u529f\u80fd\u3092\u5b9f\u73fe\u3057\u305f\u3044\u5834\u5408\u306f\u3001HTTP\u30ea\u30af\u30a8\u30b9\u30c8\u306eRange\u30d8\u30c3\u30c0\u30fc\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u3069\u306e\u4f4d\u7f6e\u304b\u3089\u8ee2\u9001\u3092\u958b\u59cb\u3059\u308b\u304b\u3092\u6c7a\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u4fee\u6b63\u3055\u308c\u305f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">handler<\/span><span class=\"hljs-params\">(w http.ResponseWriter, r *http.Request)<\/span><\/span> {\r\n\tfile, err := os.Open(<span class=\"hljs-string\">\"large_file.txt\"<\/span>)\r\n\t<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\n\t\tfmt.Println(<span class=\"hljs-string\">\"Error opening file: \"<\/span>, err)\r\n\t\t<span class=\"hljs-keyword\">return<\/span>\r\n\t}\r\n\t<span class=\"hljs-keyword\">defer<\/span> file.Close()\r\n\r\n\tfileInfo, err := file.Stat()\r\n\t<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\n\t\tfmt.Println(<span class=\"hljs-string\">\"Error getting file info: \"<\/span>, err)\r\n\t\t<span class=\"hljs-keyword\">return<\/span>\r\n\t}\r\n\r\n\tw.Header().Set(<span class=\"hljs-string\">\"Content-Disposition\"<\/span>, <span class=\"hljs-string\">\"attachment; filename=large_file.txt\"<\/span>)\r\n\tw.Header().Set(<span class=\"hljs-string\">\"Content-Type\"<\/span>, <span class=\"hljs-string\">\"application\/octet-stream\"<\/span>)\r\n\tw.Header().Set(<span class=\"hljs-string\">\"Content-Length\"<\/span>, strconv.FormatInt(fileInfo.Size(), <span class=\"hljs-number\">10<\/span>))\r\n\r\n\trangeHeader := r.Header.Get(<span class=\"hljs-string\">\"Range\"<\/span>)\r\n\t<span class=\"hljs-keyword\">if<\/span> rangeHeader != <span class=\"hljs-string\">\"\"<\/span> {\r\n\t\tstartRange, endRange, err := parseRangeHeader(rangeHeader, fileInfo.Size())\r\n\t\t<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\n\t\t\tfmt.Println(<span class=\"hljs-string\">\"Error parsing range header: \"<\/span>, err)\r\n\t\t\t<span class=\"hljs-keyword\">return<\/span>\r\n\t\t}\r\n\t\tw.Header().Set(<span class=\"hljs-string\">\"Content-Range\"<\/span>, fmt.Sprintf(<span class=\"hljs-string\">\"bytes %d-%d\/%d\"<\/span>, startRange, endRange, fileInfo.Size()))\r\n\t\thttp.ServeContent(w, r, <span class=\"hljs-string\">\"large_file.txt\"<\/span>, fileInfo.ModTime(), io.NewSectionReader(file, startRange, endRange-startRange+<span class=\"hljs-number\">1<\/span>))\r\n\t} <span class=\"hljs-keyword\">else<\/span> {\r\n\t\thttp.ServeContent(w, r, <span class=\"hljs-string\">\"large_file.txt\"<\/span>, fileInfo.ModTime(), file)\r\n\t}\r\n}\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">parseRangeHeader<\/span><span class=\"hljs-params\">(rangeHeader <span class=\"hljs-type\">string<\/span>, fileSize <span class=\"hljs-type\">int64<\/span>)<\/span><\/span> (<span class=\"hljs-type\">int64<\/span>, <span class=\"hljs-type\">int64<\/span>, <span class=\"hljs-type\">error<\/span>) {\r\n\tprefix := <span class=\"hljs-string\">\"bytes=\"<\/span>\r\n\t<span class=\"hljs-keyword\">if<\/span> <span class=\"hljs-built_in\">len<\/span>(rangeHeader) &lt; <span class=\"hljs-built_in\">len<\/span>(prefix) || rangeHeader[:<span class=\"hljs-built_in\">len<\/span>(prefix)] != prefix {\r\n\t\t<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, fmt.Errorf(<span class=\"hljs-string\">\"Invalid range header format\"<\/span>)\r\n\t}\r\n\trangeStr := rangeHeader[<span class=\"hljs-built_in\">len<\/span>(prefix):]\r\n\r\n\tdashIndex := strings.IndexByte(rangeStr, <span class=\"hljs-string\">'-'<\/span>)\r\n\t<span class=\"hljs-keyword\">if<\/span> dashIndex == <span class=\"hljs-number\">-1<\/span> {\r\n\t\t<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, fmt.Errorf(<span class=\"hljs-string\">\"Invalid range header format\"<\/span>)\r\n\t}\r\n\r\n\tstartRange, err := strconv.ParseInt(rangeStr[:dashIndex], <span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">64<\/span>)\r\n\t<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\n\t\t<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, err\r\n\t}\r\n\r\n\tendRangeStr := rangeStr[dashIndex+<span class=\"hljs-number\">1<\/span>:]\r\n\t<span class=\"hljs-keyword\">var<\/span> endRange <span class=\"hljs-type\">int64<\/span>\r\n\t<span class=\"hljs-keyword\">if<\/span> endRangeStr == <span class=\"hljs-string\">\"\"<\/span> {\r\n\t\tendRange = fileSize - <span class=\"hljs-number\">1<\/span>\r\n\t} <span class=\"hljs-keyword\">else<\/span> {\r\n\t\tendRange, err = strconv.ParseInt(endRangeStr, <span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">64<\/span>)\r\n\t\t<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\n\t\t\t<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, err\r\n\t\t}\r\n\t}\r\n\r\n\t<span class=\"hljs-keyword\">return<\/span> startRange, endRange, <span class=\"hljs-literal\">nil<\/span>\r\n}\r\n<\/code><\/pre>\n<p>\u4fee\u6b63\u3055\u308c\u305f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001\u307e\u305aHTTP\u30ea\u30af\u30a8\u30b9\u30c8\u306eRange\u30d8\u30c3\u30c0\u30fc\u3092\u89e3\u6790\u3057\u3001\u305d\u306e\u5f8c\u30ea\u30af\u30a8\u30b9\u30c8\u3055\u308c\u305f\u7bc4\u56f2\u306b\u5fdc\u3058\u3066\u30d5\u30a1\u30a4\u30eb\u5185\u5bb9\u3092\u8aad\u307f\u53d6\u308a\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u8ee2\u9001\u3055\u308c\u308b\u5185\u5bb9\u306e\u7bc4\u56f2\u3092\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306bContent-Range\u30d8\u30c3\u30c0\u30fc\u3092\u8a2d\u5b9a\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u3053\u306e\u65b9\u6cd5\u306b\u3088\u308a\u3001\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u306e\u8ee2\u9001\u3084\u9014\u4e2d\u3067\u306e\u7d9a\u304d\u304b\u3089\u8ee2\u9001\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002\u5b9f\u969b\u306e\u5fdc\u7528\u3067\u306f\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30b3\u30fc\u30c9\u3092\u3055\u3089\u306b\u6700\u9069\u5316\u3057\u305f\u308a\u62e1\u5f35\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30b4\u30fc\u30e9\u30f3\u30b0\u3067\u306f\u3001\u5927\u5bb9\u91cf\u30d5\u30a1\u30a4\u30eb\u306e\u8ee2\u9001\u3084\u4e00\u6642\u505c\u6b62\u3057\u305f\u7b87\u6240\u304b\u3089\u306e\u7d99\u7d9a\u8ee2\u9001\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306bHTTP\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002 package main import ( &#8220;fmt&#8221; &#8221; [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[413,2711,26,2759],"class_list":["post-7448","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-go","tag-2711","tag-26","tag-2759"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Go\u8a00\u8a9e\uff1a\u5927\u5bb9\u91cf\u30d5\u30a1\u30a4\u30eb\u8ee2\u9001\u3068\u4e2d\u65ad\u304b\u3089\u306e\u518d\u958b\u3010\u5b9f\u88c5\u30ac\u30a4\u30c9\u3011 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Go\u8a00\u8a9e\u3067\u5927\u5bb9\u91cf\u30d5\u30a1\u30a4\u30eb\u3092\u52b9\u7387\u7684\u306b\u8ee2\u9001\u3057\u3001\u4e2d\u65ad\u304b\u3089\u306e\u518d\u958b\u3092\u53ef\u80fd\u306b\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\u3002\u5b9f\u88c5\u624b\u9806\u3068\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u4ed8\u304d\u3067\u3001\u521d\u5fc3\u8005\u3067\u3082\u5b89\u5fc3\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/golang\u3067\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u306e\u8ee2\u9001\u3068\u9014\u4e2d\u3067\u306e\u7d99\u7d9a\u8ee2\u9001\u3092\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Go\u8a00\u8a9e\uff1a\u5927\u5bb9\u91cf\u30d5\u30a1\u30a4\u30eb\u8ee2\u9001\u3068\u4e2d\u65ad\u304b\u3089\u306e\u518d\u958b\u3010\u5b9f\u88c5\u30ac\u30a4\u30c9\u3011\" \/>\n<meta property=\"og:description\" content=\"Go\u8a00\u8a9e\u3067\u5927\u5bb9\u91cf\u30d5\u30a1\u30a4\u30eb\u3092\u52b9\u7387\u7684\u306b\u8ee2\u9001\u3057\u3001\u4e2d\u65ad\u304b\u3089\u306e\u518d\u958b\u3092\u53ef\u80fd\u306b\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\u3002\u5b9f\u88c5\u624b\u9806\u3068\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u4ed8\u304d\u3067\u3001\u521d\u5fc3\u8005\u3067\u3082\u5b89\u5fc3\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/golang\u3067\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u306e\u8ee2\u9001\u3068\u9014\u4e2d\u3067\u306e\u7d99\u7d9a\u8ee2\u9001\u3092\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-14T12:44:13+00:00\" \/>\n<meta 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