NAME

       libcurl-env-dbg - environment variables libcurl DEBUGBUILD understands

DESCRIPTION

       This  is  a  set of variables only recognized and used if libcurl was built "debug enabled", which should
       never be true for a library used in production.  These variables are  intended  for  internal  use  only,
       subject to change and have many effects on the behavior of libcurl. Refer to the source code to determine
       how exactly they are being used.

              CURL_ALTSVC_HTTP
                     Bypass the AltSvc HTTPS protocol restriction if this variable exists.

              CURL_DBG_SOCK_RBLOCK
                     The  percentage  of  recv()  calls  that  should  be answered with a EAGAIN at random.  For
                     TCP/UNIX sockets.

              CURL_DBG_SOCK_RMAX
                     The maximum data that shall be received from the network in one recv() call.  For  TCP/UNIX
                     sockets. This is applied to every recv.

                     Example:  CURL_DBG_SOCK_RMAX=400  means  recv  buffer  size  is limited to a maximum of 400
                     bytes.

              CURL_DBG_SOCK_WBLOCK
                     The percentage of send() calls that should be  answered  with  a  EAGAIN  at  random.   For
                     TCP/UNIX sockets.

              CURL_DBG_SOCK_WPARTIAL
                     The  percentage of data that shall be written to the network. For TCP/UNIX sockets. This is
                     applied to every send.

                     Example: CURL_DBG_SOCK_WPARTIAL=80 means a send with 1000 bytes would only send 800.

              CURL_DBG_QUIC_WBLOCK
                     The percentage of send() calls that should be answered with EAGAIN at random.  QUIC only.

              CURL_DEBUG
                     Trace logging behavior as an alternative to calling curl_global_trace(3).

                     Example: CURL_DEBUG=http/2 means trace details about HTTP/2 handling.

              CURL_DEBUG_SIZE
                     Fake the size returned by CURLINFO_HEADER_SIZE and CURLINFO_REQUEST_SIZE.

              CURL_GETHOSTNAME
                     Fake the local machine's unqualified hostname for NTLM and SMTP.

              CURL_HSTS_HTTP
                     Bypass the HSTS HTTPS protocol restriction if this variable exists.

              CURL_FORCETIME
                     A time of 0 is used for AWS signatures and NTLM if this variable exists.

              CURL_ENTROPY
                     A fixed faked value to use instead of a proper random number so that functions  in  libcurl
                     that are otherwise getting random outputs can be tested for what they generate.

              CURL_SMALLREQSEND
                     An alternative size of HTTP data to be sent at a time only if smaller than the current.

              CURL_SMALLSENDS
                     An alternative size of socket data to be sent at a time only if smaller than the current.

              CURL_TIME
                     Fake unix timestamp to use for AltSvc, HSTS and CURLINFO variables that are time related.

                     This  variable  can  also be used to fake the data returned by some CURLINFO variables that
                     are not time-related (such as CURLINFO_LOCAL_PORT), and in that case the  value  is  not  a
                     timestamp.

              CURL_TRACE
                     LDAP tracing is enabled if this variable exists and its value is 1 or greater.

                     OpenLDAP tracing is separate. Refer to CURL_OPENLDAP_TRACE.

              CURL_NTLM_WB_FILE
                     Debug-version of the ntlm-wb executable.

              CURL_OPENLDAP_TRACE
                     OpenLDAP  tracing is enabled if this variable exists and its value is 1 or greater. There's
                     a number of debug levels, refer to openldap.c comments.

SEE ALSO

       libcurl-env(3)

libcurl 8.5.0                                  September 07, 2023                             libcurl-env-dbg(3)