xref: /aosp_15_r20/external/curl/docs/libcurl/curl_easy_getinfo.md (revision 6236dae45794135f37c4eb022389c904c8b0090d)

---
c: Copyright (C) Daniel Stenberg, <[email protected]>, et al.
SPDX-License-Identifier: curl
Title: curl_easy_getinfo
Section: 3
Source: libcurl
See-also:
  - curl_easy_setopt (3)
Protocol:
  - All
Added-in: 7.4.1
---

# NAME

curl_easy_getinfo - extract information from a curl handle

# SYNOPSIS

~~~c
#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *curl, CURLINFO info, ... );
~~~

# DESCRIPTION

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.

# OPTIONS

The following information can be extracted:

## CURLINFO_ACTIVESOCKET

The session's active socket. See CURLINFO_ACTIVESOCKET(3)

## CURLINFO_APPCONNECT_TIME

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)

## CURLINFO_APPCONNECT_TIME_T

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)

## CURLINFO_CAINFO

Get the default value for CURLOPT_CAINFO(3). See CURLINFO_CAINFO(3)

## CURLINFO_CAPATH

Get the default value for CURLOPT_CAPATH(3). See CURLINFO_CAPATH(3)

## CURLINFO_CERTINFO

Certificate chain. See CURLINFO_CERTINFO(3)

## CURLINFO_CONDITION_UNMET

Whether or not a time conditional was met or 304 HTTP response.
See CURLINFO_CONDITION_UNMET(3)

## CURLINFO_CONNECT_TIME

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)

## CURLINFO_CONNECT_TIME_T

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).

## CURLINFO_CONN_ID

The ID of the last connection used by the transfer. (Added in 8.2.0)
See CURLINFO_CONN_ID(3)

## CURLINFO_CONTENT_LENGTH_DOWNLOAD

(**Deprecated**) Content length from the Content-Length header.
See CURLINFO_CONTENT_LENGTH_DOWNLOAD(3)

## CURLINFO_CONTENT_LENGTH_DOWNLOAD_T

Content length from the Content-Length header.
See CURLINFO_CONTENT_LENGTH_DOWNLOAD_T(3)

## CURLINFO_CONTENT_LENGTH_UPLOAD

(**Deprecated**) Upload size. See CURLINFO_CONTENT_LENGTH_UPLOAD(3)

## CURLINFO_CONTENT_LENGTH_UPLOAD_T

Upload size. See CURLINFO_CONTENT_LENGTH_UPLOAD_T(3)

## CURLINFO_CONTENT_TYPE

Content type from the `Content-Type:` header. We recommend using
curl_easy_header(3) instead. See CURLINFO_CONTENT_TYPE(3)

## CURLINFO_COOKIELIST

List of all known cookies. See CURLINFO_COOKIELIST(3)

## CURLINFO_EARLYDATA_SENT_T

Amount of TLS early data sent (in number of bytes) when
CURLSSLOPT_EARLYDATA is enabled.

## CURLINFO_EFFECTIVE_METHOD

Last used HTTP method. See CURLINFO_EFFECTIVE_METHOD(3)

## CURLINFO_EFFECTIVE_URL

Last used URL. See CURLINFO_EFFECTIVE_URL(3)

## CURLINFO_FILETIME

Remote time of the retrieved document. See CURLINFO_FILETIME(3)

## CURLINFO_FILETIME_T

Remote time of the retrieved document. See CURLINFO_FILETIME_T(3)

## CURLINFO_FTP_ENTRY_PATH

The entry path after logging in to an FTP server. See
CURLINFO_FTP_ENTRY_PATH(3)

## CURLINFO_HEADER_SIZE

Number of bytes of all headers received. See CURLINFO_HEADER_SIZE(3)

## CURLINFO_HTTPAUTH_AVAIL

Available HTTP authentication methods. See CURLINFO_HTTPAUTH_AVAIL(3)

## CURLINFO_HTTP_CONNECTCODE

Last proxy CONNECT response code. See CURLINFO_HTTP_CONNECTCODE(3)

## CURLINFO_HTTP_VERSION

The http version used in the connection. See CURLINFO_HTTP_VERSION(3)

## CURLINFO_LASTSOCKET

(**Deprecated**) Last socket used. See CURLINFO_LASTSOCKET(3)

## CURLINFO_LOCAL_IP

Source IP address of the last connection. See CURLINFO_LOCAL_IP(3)

## CURLINFO_LOCAL_PORT

Source port number of the last connection. See CURLINFO_LOCAL_PORT(3)

## CURLINFO_NAMELOOKUP_TIME

Time from start until name resolving completed as a double. See
CURLINFO_NAMELOOKUP_TIME(3)

## CURLINFO_NAMELOOKUP_TIME_T

Time from start until name resolving completed in number of microseconds. See
CURLINFO_NAMELOOKUP_TIME_T(3)

## CURLINFO_NUM_CONNECTS

Number of new successful connections used for previous transfer.
See CURLINFO_NUM_CONNECTS(3)

## CURLINFO_OS_ERRNO

The errno from the last failure to connect. See CURLINFO_OS_ERRNO(3)

## CURLINFO_POSTTRANSFER_TIME_T

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)

## CURLINFO_PRETRANSFER_TIME

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)

## CURLINFO_PRETRANSFER_TIME_T

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)

## CURLINFO_PRIMARY_IP

Destination IP address of the last connection. See CURLINFO_PRIMARY_IP(3)

## CURLINFO_PRIMARY_PORT

Destination port of the last connection. See CURLINFO_PRIMARY_PORT(3)

## CURLINFO_PRIVATE

User's private data pointer. See CURLINFO_PRIVATE(3)

## CURLINFO_PROTOCOL

(**Deprecated**) The protocol used for the connection. (Added in 7.52.0) See
CURLINFO_PROTOCOL(3)

## CURLINFO_PROXYAUTH_AVAIL

Available HTTP proxy authentication methods. See CURLINFO_PROXYAUTH_AVAIL(3)

## CURLINFO_PROXY_ERROR

Detailed proxy error. See CURLINFO_PROXY_ERROR(3)

## CURLINFO_PROXY_SSL_VERIFYRESULT

Proxy certificate verification result. See CURLINFO_PROXY_SSL_VERIFYRESULT(3)

## CURLINFO_QUEUE_TIME_T

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)

## CURLINFO_REDIRECT_COUNT

Total number of redirects that were followed. See CURLINFO_REDIRECT_COUNT(3)

## CURLINFO_REDIRECT_TIME

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)

## CURLINFO_REDIRECT_TIME_T

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)

## CURLINFO_REDIRECT_URL

URL a redirect would take you to, had you enabled redirects. See
CURLINFO_REDIRECT_URL(3)

## CURLINFO_REFERER

Referrer header. See CURLINFO_REFERER(3)

## CURLINFO_REQUEST_SIZE

Number of bytes sent in the issued HTTP requests. See CURLINFO_REQUEST_SIZE(3)

## CURLINFO_RESPONSE_CODE

Last received response code. See CURLINFO_RESPONSE_CODE(3)

## CURLINFO_RETRY_AFTER

The value from the Retry-After header. See CURLINFO_RETRY_AFTER(3)

## CURLINFO_RTSP_CLIENT_CSEQ

The RTSP client CSeq that is expected next. See CURLINFO_RTSP_CLIENT_CSEQ(3)

## CURLINFO_RTSP_CSEQ_RECV

RTSP CSeq last received. See CURLINFO_RTSP_CSEQ_RECV(3)

## CURLINFO_RTSP_SERVER_CSEQ

The RTSP server CSeq that is expected next. See CURLINFO_RTSP_SERVER_CSEQ(3)

## CURLINFO_RTSP_SESSION_ID

RTSP session ID. See CURLINFO_RTSP_SESSION_ID(3)

## CURLINFO_SCHEME

The scheme used for the connection. (Added in 7.52.0) See CURLINFO_SCHEME(3)

## CURLINFO_SIZE_DOWNLOAD

(**Deprecated**) Number of bytes downloaded. See CURLINFO_SIZE_DOWNLOAD(3)

## CURLINFO_SIZE_DOWNLOAD_T

Number of bytes downloaded. See CURLINFO_SIZE_DOWNLOAD_T(3)

## CURLINFO_SIZE_UPLOAD

(**Deprecated**) Number of bytes uploaded. See CURLINFO_SIZE_UPLOAD(3)

## CURLINFO_SIZE_UPLOAD_T

Number of bytes uploaded. See CURLINFO_SIZE_UPLOAD_T(3)

## CURLINFO_SPEED_DOWNLOAD

(**Deprecated**) Average download speed. See CURLINFO_SPEED_DOWNLOAD(3)

## CURLINFO_SPEED_DOWNLOAD_T

Average download speed. See CURLINFO_SPEED_DOWNLOAD_T(3)

## CURLINFO_SPEED_UPLOAD

(**Deprecated**) Average upload speed. See CURLINFO_SPEED_UPLOAD(3)

## CURLINFO_SPEED_UPLOAD_T

Average upload speed in number of bytes per second. See
CURLINFO_SPEED_UPLOAD_T(3)

## CURLINFO_SSL_ENGINES

A list of OpenSSL crypto engines. See CURLINFO_SSL_ENGINES(3)

## CURLINFO_SSL_VERIFYRESULT

Certificate verification result. See CURLINFO_SSL_VERIFYRESULT(3)

## CURLINFO_STARTTRANSFER_TIME

The time it took from the start until the first byte is received by libcurl.
As a double. See CURLINFO_STARTTRANSFER_TIME(3)

## CURLINFO_STARTTRANSFER_TIME_T

The time it took from the start until the first byte is received by libcurl.
In microseconds. See CURLINFO_STARTTRANSFER_TIME_T(3)

## CURLINFO_TLS_SESSION

(**Deprecated**) TLS session info that can be used for further processing. See
CURLINFO_TLS_SESSION(3). Use CURLINFO_TLS_SSL_PTR(3) instead.

## CURLINFO_TLS_SSL_PTR

TLS session info that can be used for further processing. See
CURLINFO_TLS_SSL_PTR(3)

## CURLINFO_TOTAL_TIME

Total time of previous transfer. See CURLINFO_TOTAL_TIME(3)

## CURLINFO_TOTAL_TIME_T

Total time of previous transfer. See CURLINFO_TOTAL_TIME_T(3)

## CURLINFO_USED_PROXY

Whether the proxy was used (Added in 8.7.0). See CURLINFO_USED_PROXY(3)

## CURLINFO_XFER_ID

The ID of the transfer. (Added in 8.2.0) See CURLINFO_XFER_ID(3)

# TIMES

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)

# %PROTOCOLS%

# EXAMPLE

~~~c
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);
  }
}
~~~

# %AVAILABILITY%

# RETURN VALUE

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