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Top Forums UNIX for Dummies Questions & Answers When downloading a webpage by curl, what happen? Post 302895320 by bakunin on Monday 31st of March 2014 07:46:04 AM
Old 03-31-2014
Quote:
Originally Posted by postcd
when im downloading an webpage from command line (CLI) by curl or wget the target website is loaded like i load it from browser?
In principle: yes. A web page is served similar to a multipart/mime-message over e-mail. You have some header information (encoded into the URL), some "framework information" and optionally one or several additional data sources (pictures, videos, programs like flash, ...) embedded in this "framework". A browser receives such messages, displays them (quite like a mail reader would do for mails) and - driven by user actions - replies with a similar sort of messages which can range from very simple to equally complicated and similarly structured (quite like you answer a mail with a reply of your own).

Quote:
Originally Posted by postcd
meaning target server connect to database and render data from mysql? Or only static content is downloaded?
Some of the elements i talked about above only work interactively. Both cURL and wget have (limited) provisions to deal with that. That means, some aspects of a user sitting there and interactively clicking/etc. something can be emulated, some cannot.

I hope this helps.

bakunin
 

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CURLOPT_VERBOSE(3)					     curl_easy_setopt options						CURLOPT_VERBOSE(3)

NAME
CURLOPT_VERBOSE - set verbose mode on/off SYNOPSIS
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_VERBOSE, long onoff); DESCRIPTION
Set the onoff parameter to 1 to make the library display a lot of verbose information about its operations on this handle. Very useful for libcurl and/or protocol debugging and understanding. The verbose information will be sent to stderr, or the stream set with CUR- LOPT_STDERR(3). You hardly ever want this set in production use, you will almost always want this when you debug/report problems. To also get all the protocol data sent and received, consider using the CURLOPT_DEBUGFUNCTION(3). DEFAULT
0, meaning disabled. PROTOCOLS
All EXAMPLE
CURL *curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "http://example.com"); /* ask libcurl to show us the verbose output */ curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); /* Perform the request */ curl_easy_perform(curl); } AVAILABILITY
Always RETURN VALUE
Returns CURLE_OK SEE ALSO
CURLOPT_STDERR(3), CURLOPT_DEBUGFUNCTION(3), libcurl 7.54.0 February 03, 2016 CURLOPT_VERBOSE(3)
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