curl_easy_getinfo(3) Library Functions Manual curl_easy_getinfo(3)

curl_easy_getinfo - extract information from a curl handle

#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *curl, CURLINFO info, ... );

Get the info kept in the curl handle. The third argument MUST be pointing to the specific type of the used option which is documented in each man page of the info option. The data is stored accordingly and can be relied upon only if this function returns CURLE_OK. Use this function after a performed transfer if you want to get transfer related data.

You should not free the memory returned by this function unless it is explicitly mentioned below.

The following information can be extracted:

The session's active socket. See CURLINFO_ACTIVESOCKET(3)
The time it took from the start until the SSL connect/handshake with the remote host was completed as a double in number of seconds. (Added in 7.19.0)
The time it took from the start until the SSL connect/handshake with the remote host was completed in number of microseconds. (Added in 7.60.0) See CURLINFO_APPCONNECT_TIME_T(3)
Get the default value for CURLOPT_CAINFO(3). See CURLINFO_CAINFO(3)
Get the default value for CURLOPT_CAPATH(3). See CURLINFO_CAPATH(3)
Certificate chain. See CURLINFO_CERTINFO(3)
Whether or not a time conditional was met or 304 HTTP response. See CURLINFO_CONDITION_UNMET(3)
The time it took from the start until the connect to the remote host (or proxy) was completed. As a double. See CURLINFO_CONNECT_TIME(3)
The time it took from the start until the connect to the remote host (or proxy) was completed. In microseconds. See CURLINFO_CONNECT_TIME_T(3).
The ID of the last connection used by the transfer. (Added in 8.2.0) See CURLINFO_CONN_ID(3)
(Deprecated) Content length from the Content-Length header. See CURLINFO_CONTENT_LENGTH_DOWNLOAD(3)
Content length from the Content-Length header. See CURLINFO_CONTENT_LENGTH_DOWNLOAD_T(3)
(Deprecated) Upload size. See CURLINFO_CONTENT_LENGTH_UPLOAD(3)
Upload size. See CURLINFO_CONTENT_LENGTH_UPLOAD_T(3)
Content type from the Content-Type: header. We recommend using curl_easy_header(3) instead. See CURLINFO_CONTENT_TYPE(3)
List of all known cookies. See CURLINFO_COOKIELIST(3)
Amount of TLS early data sent (in number of bytes) when CURLSSLOPT_EARLYDATA is enabled.
Last used HTTP method. See CURLINFO_EFFECTIVE_METHOD(3)
Last used URL. See CURLINFO_EFFECTIVE_URL(3)
Remote time of the retrieved document. See CURLINFO_FILETIME(3)
Remote time of the retrieved document. See CURLINFO_FILETIME_T(3)
The entry path after logging in to an FTP server. See CURLINFO_FTP_ENTRY_PATH(3)
Number of bytes of all headers received. See CURLINFO_HEADER_SIZE(3)
Available HTTP authentication methods. See CURLINFO_HTTPAUTH_AVAIL(3)
Last proxy CONNECT response code. See CURLINFO_HTTP_CONNECTCODE(3)
The http version used in the connection. See CURLINFO_HTTP_VERSION(3)
(Deprecated) Last socket used. See CURLINFO_LASTSOCKET(3)
Source IP address of the last connection. See CURLINFO_LOCAL_IP(3)
Source port number of the last connection. See CURLINFO_LOCAL_PORT(3)
Time from start until name resolving completed as a double. See CURLINFO_NAMELOOKUP_TIME(3)
Time from start until name resolving completed in number of microseconds. See CURLINFO_NAMELOOKUP_TIME_T(3)
Number of new successful connections used for previous transfer. See CURLINFO_NUM_CONNECTS(3)
The errno from the last failure to connect. See CURLINFO_OS_ERRNO(3)
The time it took from the start until the last byte is sent by libcurl. In microseconds. (Added in 8.10.0) See CURLINFO_POSTTRANSFER_TIME_T(3)
The time it took from the start until the file transfer is just about to begin. This includes all pre-transfer commands and negotiations that are specific to the particular protocol(s) involved. See CURLINFO_PRETRANSFER_TIME(3)
The time it took from the start until the file transfer is just about to begin. This includes all pre-transfer commands and negotiations that are specific to the particular protocol(s) involved. In microseconds. See CURLINFO_PRETRANSFER_TIME_T(3)
Destination IP address of the last connection. See CURLINFO_PRIMARY_IP(3)
Destination port of the last connection. See CURLINFO_PRIMARY_PORT(3)
User's private data pointer. See CURLINFO_PRIVATE(3)
(Deprecated) The protocol used for the connection. (Added in 7.52.0) See CURLINFO_PROTOCOL(3)
Available HTTP proxy authentication methods. See CURLINFO_PROXYAUTH_AVAIL(3)
Detailed proxy error. See CURLINFO_PROXY_ERROR(3)
Proxy certificate verification result. See CURLINFO_PROXY_SSL_VERIFYRESULT(3)
The time during which the transfer was held in a waiting queue before it could start for real in number of microseconds. (Added in 8.6.0) See CURLINFO_QUEUE_TIME_T(3)
Total number of redirects that were followed. See CURLINFO_REDIRECT_COUNT(3)
The time it took for all redirection steps include name lookup, connect, pretransfer and transfer before final transaction was started. So, this is zero if no redirection took place. As a double. See CURLINFO_REDIRECT_TIME(3)
The time it took for all redirection steps include name lookup, connect, pretransfer and transfer before final transaction was started. So, this is zero if no redirection took place. In number of microseconds. See CURLINFO_REDIRECT_TIME_T(3)
URL a redirect would take you to, had you enabled redirects. See CURLINFO_REDIRECT_URL(3)
Referrer header. See CURLINFO_REFERER(3)
Number of bytes sent in the issued HTTP requests. See CURLINFO_REQUEST_SIZE(3)
Last received response code. See CURLINFO_RESPONSE_CODE(3)
The value from the Retry-After header. See CURLINFO_RETRY_AFTER(3)
The RTSP client CSeq that is expected next. See CURLINFO_RTSP_CLIENT_CSEQ(3)
RTSP CSeq last received. See CURLINFO_RTSP_CSEQ_RECV(3)
The RTSP server CSeq that is expected next. See CURLINFO_RTSP_SERVER_CSEQ(3)
RTSP session ID. See CURLINFO_RTSP_SESSION_ID(3)
The scheme used for the connection. (Added in 7.52.0) See CURLINFO_SCHEME(3)
(Deprecated) Number of bytes downloaded. See CURLINFO_SIZE_DOWNLOAD(3)
Number of bytes downloaded. See CURLINFO_SIZE_DOWNLOAD_T(3)
(Deprecated) Number of bytes uploaded. See CURLINFO_SIZE_UPLOAD(3)
Number of bytes uploaded. See CURLINFO_SIZE_UPLOAD_T(3)
(Deprecated) Average download speed. See CURLINFO_SPEED_DOWNLOAD(3)
Average download speed. See CURLINFO_SPEED_DOWNLOAD_T(3)
(Deprecated) Average upload speed. See CURLINFO_SPEED_UPLOAD(3)
Average upload speed in number of bytes per second. See CURLINFO_SPEED_UPLOAD_T(3)
A list of OpenSSL crypto engines. See CURLINFO_SSL_ENGINES(3)
Certificate verification result. See CURLINFO_SSL_VERIFYRESULT(3)
The time it took from the start until the first byte is received by libcurl. As a double. See CURLINFO_STARTTRANSFER_TIME(3)
The time it took from the start until the first byte is received by libcurl. In microseconds. See CURLINFO_STARTTRANSFER_TIME_T(3)
(Deprecated) TLS session info that can be used for further processing. See CURLINFO_TLS_SESSION(3). Use CURLINFO_TLS_SSL_PTR(3) instead.
TLS session info that can be used for further processing. See CURLINFO_TLS_SSL_PTR(3)
Total time of previous transfer. See CURLINFO_TOTAL_TIME(3)
Total time of previous transfer. See CURLINFO_TOTAL_TIME_T(3)
Whether the proxy was used (Added in 8.7.0). See CURLINFO_USED_PROXY(3)
The ID of the transfer. (Added in 8.2.0) See CURLINFO_XFER_ID(3)

An overview of the time values available from curl_easy_getinfo(3)

curl_easy_perform()
    |
    |--QUEUE
    |--|--NAMELOOKUP
    |--|--|--CONNECT
    |--|--|--|--APPCONNECT
    |--|--|--|--|--PRETRANSFER
    |--|--|--|--|--|--POSTTRANSFER
    |--|--|--|--|--|--|--STARTTRANSFER
    |--|--|--|--|--|--|--|--TOTAL
    |--|--|--|--|--|--|--|--REDIRECT


CURLINFO_QUEUE_TIME_T(3), CURLINFO_NAMELOOKUP_TIME_T(3),
CURLINFO_CONNECT_TIME_T(3), CURLINFO_APPCONNECT_TIME_T(3),
CURLINFO_PRETRANSFER_TIME_T(3), CURLINFO_POSTTRANSFER_TIME_T(3),
CURLINFO_STARTTRANSFER_TIME_T(3), CURLINFO_TOTAL_TIME_T(3),
CURLINFO_REDIRECT_TIME_T(3)

This functionality affects all supported protocols

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
    res = curl_easy_perform(curl);
    if(CURLE_OK == res) {
      char *ct;
      /* ask for the content-type */
      res = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct);
      if((CURLE_OK == res) && ct)
        printf("We received Content-Type: %s\n", ct);
    }
    /* always cleanup */
    curl_easy_cleanup(curl);
  }
}

Added in curl 7.4.1

If the operation was successful, CURLE_OK is returned. Otherwise an appropriate error code is returned.

curl_easy_setopt(3)

2024-11-07 libcurl