How to get the file size from http headers

Question

I want to get the size of an http:/.../file before I download it. The file can be a webpage, image, or a media file. Can this be done with HTTP headers? How do I download just the file HTTP header? JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

Yes, assuming the HTTP server you're talking to supports/allows this: public long GetFileSize(string url) { long result = -1; System.Net.WebRequest req = System.Net.WebRequest.Create(url); req.Method = "HEAD"; using (System.Net.WebResponse resp = req.GetResponse()) { if (long.TryParse(resp.Headers.Get("Content-Length"), out long ContentLength)) { result = ContentLength; } } return result; } If using the HEAD method is not allowed, or the Content-Length header is not present in the server reply, the only way to determine the size of the content on the server is to download it. Since this is not particularly reliable, most servers will include this information.