Fixes documentation code for pass through example

README.md

@@ -440,27 +440,32 @@ while ( $client->hasUnhandledResponses() )
 1
 ```
 
-### Reading request as it goes back piece by piece (pass-through)
+### Reading output buffer from worker script using pass through callbacks
 
-It may be useful to see the progression of a request, such as a batch. Say you have a PHP script like:
+It may be useful to see the progression of a requested script by having access to the flushed output of that script.
+The php.ini default output buffering for php-fpm is 4096 bytes and is (hard-coded) disabled for CLI mode. ([See documentation](http://php.net/manual/en/outcontrol.configuration.php#ini.output-buffering))
+Calling `ob_implicit_flush()` causes every call to `echo` or `print` to immediately be flushed.  
+
+The callee script could look like this:
 ```php
-<?php
-ob_implicit_flush(); // needed so that every echo() is flushed when length of echo'ed text is over ini:output_buffering's value
-function show($string)
+<?php declare(strict_types=1);
+
+ob_implicit_flush();
+
+function show( string $string )
 {
-	echo str_repeat("\033[0m", max(1, ceil((4096 - strlen($string) % 4096) / 4))).$string.PHP_EOL; // replace 4096 with your output_buffering's value if different
-	flush();
+	echo $string . str_repeat( "\r", 4096 - strlen( $string ) ) . PHP_EOL;
+	sleep( 1 );
 }
-show('Very long script to run');
-// one long task
-show('First long task ended');
-// another long task
-show('Second long task ended');
 
-echo 'End of script'; // no need of show() here, as the script will end and send the final text.
+show( 'One' );
+show( 'Two' );
+show( 'Three' );
+
+echo 'End';
 ```
 
-The `caller.php` file which is run from the console:
+The caller than could look like this:
 ```php
 <?php declare(strict_types=1);
 
@@ -470,35 +475,31 @@ use hollodotme\FastCGI\Client;
 use hollodotme\FastCGI\Requests\GetRequest;
 use hollodotme\FastCGI\SocketConnections\NetworkSocket;
 
-ob_implicit_flush(); // needed here too
-
 $client  = new Client( new NetworkSocket( '127.0.0.1', 9000 ) );
 
-$passThroughCallback = function( $packet )
+$passThroughCallback = function( string $buffer )
 {
-	echo 'Batch script: ', $packet;
+	echo 'Buffer: ' . $buffer;
 };
 
-$request = new GetRequest('/path/to/target/batch/script.php', http_build_query(['key' => '1', 'sleep' => 3]));
-$request->addPassThroughCallbacks($passThroughCallback);
+$request = new GetRequest('/path/to/target/script.php', '');
+$request->addPassThroughCallbacks( $passThroughCallback );
 
 $client->sendAsyncRequest($request);
 $client->waitForResponses();
 ```
 
-Call the batch script in your console:
-```
-php /path/to/batch/caller.php
-```
-
 ```
 # prints immediately
-Very long script to run
-# after first task is done
-First long task ended
-# after second task is done
-Second long task ended
-End of script
+Buffer: Content-type: text/html; charset=UTF-8
+
+One
+# sleeps 1 sec
+Buffer: Two
+# sleeps 1 sec
+Buffer: Three
+# sleeps 1 sec
+Buffer: End
 ```
 
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