(Tcl) Get Size of File on Web Server

Demonstrates how to send a HEAD request to fetch information about a file on a web server, which hopefully includes the Content-Length in the response header.

Chilkat Tcl Extension Downloads Chilkat Tcl Extension Downloads

load ./chilkat.dll

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

set http [new_CkHttp]

# resp is a CkHttpResponse
set resp [CkHttp_GetHead $http "https://nodejs.org/dist/v10.16.1/node-v10.16.1-win-x64.zip"]
if {[CkHttp_get_LastMethodSuccess $http] == 0} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkHttp $http
    exit
}

# Examine the response header.
puts [CkHttpResponse_header $resp]

# Here is a sample response header:

# Date: Thu, 01 Aug 2019 12:47:27 GMT
# Content-Type: application/zip
# Content-Length: 17457922
# Connection: keep-alive
# Set-Cookie: __cfduid=da5b78dcdd8171683c5a578eb9c9f88c81564663647; expires=Fri, 31-Jul-20 12:47:27 GMT; path=/; domain=.nodejs.org; HttpOnly
# Last-Modified: Wed, 31 Jul 2019 18:21:57 GMT
# ETag: "5d41dc45-10a6302"
# Accept-Ranges: bytes
# Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
# Server: cloudflare
# CF-RAY: 4ff7ebb32ac4e1e2-ORD

# Get the Content-Length header.
set contentLengthStr [CkHttpResponse_getHeaderField $resp "Content-Length"]
# If the header exists...
if {[CkHttpResponse_get_LastMethodSuccess $resp] == 1} then {
    puts "Content-Length: $contentLengthStr"
    # Your application can convert the contentLengthStr to an integer and then use it....
}

delete_CkHttpResponse $resp


delete_CkHttp $http