HTTPie mangles input

commands.sh

php -S 127.0.0.1:8888 index.php > php.log 2>&1 &

curl 127.0.0.1:8888 -d foo=bar > curl.out 2>&1

http POST 127.0.0.1:8888 foo=bar > httpie.out 2>&1

curl.out

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100   133    0   126  100     7   183k  10416 --:--:-- --:--:-- --:--:--  123k
Method:
string(4) "POST"

Get:
array(0) {
}

POST:
array(1) {
  ["foo"]=>
  string(3) "bar"
}

Raw POST:
string(7) "foo=bar"

httpie.out

Method:
string(4) "POST"

Get:
array(0) {
}

POST:
array(0) {
}

Raw POST:
string(14) "{"foo": "bar"}"

index.php

<?php
echo 'Method:' . PHP_EOL;
var_dump($_SERVER['REQUEST_METHOD']);
echo PHP_EOL;
echo 'Get:'.PHP_EOL;
var_dump($_GET);
echo PHP_EOL;
echo 'POST:' .PHP_EOL;
var_dump($_POST);
echo PHP_EOL;
echo 'Raw POST:' . PHP_EOL;
var_dump(file_get_contents('php://input'));
echo PHP_EOL;