PHP - Debugging Curl

Question

I d like to see what the post fields in the request are before I send it   For debugging purposes    The PHP library  class  I am using is already made  not by me   so I am trying to understand it   As far as I can tell  it uses curl setopt   to set different options like headers and such and then it uses curl exec   to send the request   Ideas on how to see what post fields are being sent

User · Answer

Another  crude  option is to utilize netcat for dumping the full request   nc -l -p 8000 -w 3   tee curldbg txt   And of course sending the failing request to it   curl setup CURLOPT URL   http   localhost testytest      Notably that will always hang fail  since netcat won t ever construct a valid HTTP response  It s really just for inspecting what really got sent  The better option  of course  is using a http request debugging service

User · Answer

You can enable the CURLOPT VERBOSE option and log that information to a  temporary  CURLOPT STDERR      CURLOPT VERBOSE  TRUE to output verbose information  Writes output to STDERR      or the file specified using CURLOPT STDERR  curl setopt  handle  CURLOPT VERBOSE  true     verbose   fopen  php   temp    w     curl setopt  handle  CURLOPT STDERR   verbose     You can then read it after curl has done the request    result   curl exec  handle   if   result     FALSE        printf  cUrl error    d    s lt br gt  n   curl errno  handle              htmlspecialchars curl error  handle        rewind  verbose    verboseLog   stream get contents  verbose    echo  Verbose information  n lt pre gt    htmlspecialchars  verboseLog     lt  pre gt  n      I originally answered similar but more extended in a related question    More information like metrics about the last request is available via curl getinfo  This information can be useful for debugging curl requests  too  A usage example  I would normally wrap that into a function    version   curl version    extract curl getinfo  handle     metrics    lt  lt  lt EOD URL       url Code      http code   redirect count redirect s  in  redirect time secs  Content   content type Size   download content length  Own   size download  Filetime   filetime Time      total time Start    starttransfer time  DNS   namelookup time Connect   connect time Request   pretransfer time  Speed    Down   speed download  avg   Up   speed upload  avg   Curl     v  version  version    EOD

User · Answer

To just get the info of a CURL request do this    response   curl exec  ch     info   curl getinfo  ch   var dump  info

User · Answer

Here is a simpler code for the same      curl setopt  ch  CURLOPT VERBOSE  1      curl setopt  ch  CURLOPT STDERR   fp     where  fp is a file handle to output errors  For example       fp   fopen dirname   FILE      errorlog txt    w        Read on http   curl haxx se mail curlphp-2008-03 0064 html

User · Answer

If you just want a very quick way to debug the result    ch   curl init    curl exec  ch    curl error   curl error  ch   echo   lt script gt console log  curl error   lt  script gt

User · Answer

Output debug info to STDERR    curlHandler   curl init     curl setopt array  curlHandler        CURLOPT URL   gt   https   postman-echo com get foo bar       CURLOPT RETURNTRANSFER   gt  true                  Specify debug option             CURLOPT VERBOSE   gt  true       curl exec  curlHandler    curl close  curlHandler     Output debug info to file    curlHandler   curl init     curl setopt array  curlHandler        CURLOPT URL   gt   https   postman-echo com get foo bar       CURLOPT RETURNTRANSFER   gt  true                  Specify debug option              CURLOPT VERBOSE   gt  true                  Specify log file         Make sure that the folder is writable              CURLOPT STDERR   gt  fopen    curl log    w          curl exec  curlHandler    curl close  curlHandler     See https   github com andriichuk php-curl-cookbook debug-request

User · Answer

Here is an even simplier way  by writing directly to php error output  curl setopt  curl  CURLOPT VERBOSE  true   curl setopt  curl  CURLOPT STDERR  fopen  php   stderr    w

User · Answer

You can enable the CURLOPT VERBOSE option   curl setopt  curlhandle  CURLOPT VERBOSE  true     When CURLOPT VERBOSE is set  output is written to STDERR or the file specified using CURLOPT STDERR  The output is very informative   You can also use tcpdump or wireshark to watch the network traffic

[php] PHP - Debugging Curl

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