{"id":3992,"date":"2023-02-08T13:21:36","date_gmt":"2023-02-08T07:51:36","guid":{"rendered":"https:\/\/trysiteprice.com\/blog\/?p=3992"},"modified":"2023-02-08T13:21:36","modified_gmt":"2023-02-08T07:51:36","slug":"curl-if-modified-since-command-linux-unix-example","status":"publish","type":"post","link":"https:\/\/trysiteprice.com\/blog\/curl-if-modified-since-command-linux-unix-example\/","title":{"rendered":"curl: If-Modified-Since Command Linux \/ Unix Example"},"content":{"rendered":"

The “If-Modified-Since” header is used in an HTTP request to ask the server to return the requested resource only if it has been modified since the specified date and time. This allows the client to avoid downloading a resource that hasn’t changed.<\/p>\n

You can use the curl<\/code> command with the -z<\/code> or --time-cond<\/code> option to specify the “If-Modified-Since” header in your request. The argument to this option should be a date in the format “YYYYMMDDHHMMSS”.<\/p>\n

Here is an example:<\/p>\n

\n
<\/div>\n
curl -z 20170831235959<\/span> -o output_file.html<\/span> http<\/span>:\/\/www.example.com\/index.html<\/span>
\n<\/code><\/div>\n<\/div>\n

In this example, curl<\/code> will only download http:\/\/www.example.com\/index.html<\/code> if it has been modified since August 31st, 2017 at 23:59:59. If the resource hasn’t changed, curl<\/code> will not download it and will return a “304 Not Modified” HTTP status code instead.<\/p>\n

The -o<\/code> option is used to specify the output file for the resource. If the resource has been modified and is being downloaded, it will be saved to output_file.html<\/code>.<\/p>\n","protected":false},"excerpt":{"rendered":"

The “If-Modified-Since” header is used in an HTTP request to ask the server to return the requested resource only if it has been modified since the specified date and time. This allows the client to avoid downloading a resource that hasn’t changed. You can use the curl command with the -z or –time-cond option to … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3992","post","type-post","status-publish","format-standard","hentry","category-best-tutorial"],"yoast_head":"\ncurl: If-Modified-Since Command Linux \/ Unix Example - TrySitePrice<\/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:\/\/trysiteprice.com\/blog\/curl-if-modified-since-command-linux-unix-example\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"curl: If-Modified-Since Command Linux \/ Unix Example - TrySitePrice\" \/>\n<meta property=\"og:description\" content=\"The “If-Modified-Since” header is used in an HTTP request to ask the server to return the requested resource only if it has been modified since the specified date and time. 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