Getting HTTP request information via cURL

The PHP function curl_getinfo() provides detailed information about the executed cURL request. This article explains the meaning of each field.

Example usage

Call the function over the result of the context from curl_init():

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://baraja.cz');
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);
curl_exec($ch);
$info = curl_getinfo($ch);
curl_close($ch);
dump($info);

Table of values

The curl_getinfo() function returns an associative array from which individual keys and values can be retrieved.

Key	Example value	Explanation
url	'https://baraja.cz/'	Downloaded URL.
content_type	'text/html; charset=utf-8'	Encoding and content type used (claimed by the target server).
http_code	200	HTTP status code returned. 200 means OK.
header_size	462	HTTP request header size in bytes.
request_size	47	Request size.
	filetime	-1
ssl_verify_result	0	SSL check.
	redirect_count	0
total_time	0.233384	Total time spent waiting for response. Given in seconds.
namelookup_time	0.021608	Time taken to resolve domain over DNS records. Specified in seconds.
	connect_time	0.035031
	pretransfer_time	0.187275
upload_size	0.0	Size of the uploaded data in bytes.
size_download	0.0	Downloaded data size in bytes.
speed_download	0.0	Download speed in bytes per second.
speed_upload	0.0	Upload speed in bytes per second.
download_content_length	15522.0	Downloaded data size in bytes.
upload_content_length	-1.0	Size of uploaded data in bytes.
starttransfer_time	0.233354	Indicates the TTFB (Time To First Byte) value in seconds.
redirect_time	0.0	Time spent redirecting to download canonical content.
	redirect_url	''
primary_ip	'76.76.21.21'	From which IP the content was downloaded.
certinfo	array (0)	More details about the certificate of the target site.
primary_port	443	The network port used (80 means HTTP, 443 means HTTPS).
local_ip	'192.168.0.186'	Local IP address of the machine that sent the request.
local_port	56568	Port of the local machine from which the request was sent.
http_version	3	HTTP protocol version.
	protocol	2
ssl_verifyresult	0	SSL verification result.
scheme	'HTTPS'	Protocol at the beginning of the URL.
appconnect_time_us	186220	Time to connect to the target server. Specified in microseconds.
	connect_time_us	35031
	namelookup_time_us	21608
	pretransfer_time_us	187275
redirect_time_us	0	Time spent redirecting to download canonical content. Given in microseconds.
starttransfer_time_us	233354	Indicates the value of the TTFB (Time To First Byte) time. In microseconds.
	total_time_us	233384

Some keys may not always be available. Always verify the existence of the key and the validity of the value before reading the value.