Getting HTTP request information via cURL

06. 07. 2022

Obsah článku

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.

Jan Barášek Více o autorovi

Autor článku pracuje jako seniorní vývojář a software architekt v Praze. Navrhuje a spravuje velké webové aplikace, které znáte a používáte. Od roku 2009 nabral bohaté zkušenosti, které tímto webem předává dál.

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