Complex classes like HttpClient often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use HttpClient, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 13 | class HttpClient  | 
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| 14 | { | 
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| 15 | /**  | 
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| 16 | * The default request options.  | 
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| 17 | *  | 
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| 18 | * @var array  | 
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| 19 | */  | 
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| 20 | protected static $defaultOptions = [  | 
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| 21 | 'connect_timeout' => 5,  | 
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| 22 | 'timeout' => 30,  | 
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| 23 | ];  | 
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| 24 | |||
| 25 | /**  | 
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| 26 | * The Guzzle client.  | 
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| 27 | *  | 
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| 28 | * @var \GuzzleHttp\Client  | 
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| 29 | */  | 
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| 30 | protected $client;  | 
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| 31 | |||
| 32 | /**  | 
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| 33 | * The request options.  | 
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| 34 | *  | 
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| 35 | * @var array  | 
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| 36 | */  | 
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| 37 | protected $options = [];  | 
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| 38 | |||
| 39 | /**  | 
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| 40 | * The Guzzle response.  | 
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| 41 | *  | 
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| 42 | * @var \GuzzleHttp\Psr7\Response  | 
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| 43 | */  | 
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| 44 | protected $response;  | 
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| 45 | |||
| 46 | /**  | 
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| 47 | * Indicate whether to catch Guzzle exceptions.  | 
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| 48 | *  | 
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| 49 | * @var bool  | 
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| 50 | */  | 
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| 51 | protected $catchExceptions = true;  | 
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| 52 | |||
| 53 | /**  | 
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| 54 | * Get the default request options.  | 
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| 55 | *  | 
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| 56 | * @return array  | 
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| 57 | */  | 
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| 58 | 24 | public static function defaultOptions()  | 
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| 62 | |||
| 63 | /**  | 
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| 64 | * Set the default request options.  | 
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| 65 | *  | 
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| 66 | * @param array $options  | 
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| 67 | * @return void  | 
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| 68 | */  | 
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| 69 | 1 | public static function setDefaultOptions(array $options)  | 
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| 73 | |||
| 74 | /**  | 
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| 75 | * Create a http client instance.  | 
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| 76 | *  | 
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| 77 | * @param array|string|\Psr\Http\Message\UriInterface $options base URI or any request options  | 
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| 78 | *  | 
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| 79 | * @throws \InvalidArgumentException  | 
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| 80 | */  | 
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| 81 | 23 | public function __construct($options = [])  | 
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| 95 | |||
| 96 | /**  | 
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| 97 | * Get the Guzzle client instance.  | 
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| 98 | *  | 
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| 99 | * @return \GuzzleHttp\Client  | 
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| 100 | */  | 
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| 101 | 2 | public function getClient()  | 
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| 105 | |||
| 106 | /**  | 
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| 107 | * Get whether to catch Guzzle exceptions or not.  | 
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| 108 | *  | 
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| 109 | * @return bool  | 
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| 110 | */  | 
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| 111 | public function areExceptionsCaught()  | 
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| 115 | |||
| 116 | /**  | 
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| 117 | * Set whether to catch Guzzle exceptions or not.  | 
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| 118 | *  | 
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| 119 | * @param bool $catch  | 
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| 120 | * @return $this  | 
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| 121 | */  | 
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| 122 | public function catchExceptions($catch)  | 
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| 128 | |||
| 129 | /**  | 
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| 130 | * Get the request options using "dot" notation.  | 
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| 131 | *  | 
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| 132 | * @param string|null $key  | 
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| 133 | * @return mixed  | 
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| 134 | 3 | */  | 
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| 135 | public function getOption($key = null)  | 
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| 139 | |||
| 140 | /**  | 
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| 141 | * Set the request options using "dot" notation.  | 
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| 142 | *  | 
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| 143 | * @param string|array $key  | 
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| 144 | * @param mixed $value  | 
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| 145 | * @return $this  | 
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| 146 | */  | 
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| 147 | public function option($key, $value = null)  | 
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| 157 | |||
| 158 | /**  | 
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| 159 | * Merge the given options to the request options.  | 
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| 160 | *  | 
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| 161 | * @param array $options,...  | 
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| 162 | * @return $this  | 
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| 163 | */  | 
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| 164 | public function mergeOption(array ...$options)  | 
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| 165 |     { | 
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| 166 | $this->options = array_replace_recursive($this->options, ...$options);  | 
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| 167 | |||
| 168 | return $this;  | 
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| 169 | }  | 
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| 170 | |||
| 171 | 1 | /**  | 
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| 172 | * Remove one or many request options using "dot" notation.  | 
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| 173 | 1 | *  | 
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| 174 | * @param array|string $keys  | 
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| 175 | * @return $this  | 
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| 176 | */  | 
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| 177 | public function removeOption($keys)  | 
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| 178 |     { | 
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| 179 | Arr::forget($this->options, is_array($keys) ? $keys : func_get_args());  | 
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| 180 | |||
| 181 | return $this;  | 
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| 182 | }  | 
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| 183 | 1 | ||
| 184 | /**  | 
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| 185 | 1 | * Set a request header.  | 
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| 186 | *  | 
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| 187 | 1 | * @param string $name  | 
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| 188 | 1 | * @param mixed $value  | 
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| 189 | 1 | * @return $this  | 
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| 190 | */  | 
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| 191 | 1 | public function header($name, $value)  | 
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| 195 | |||
| 196 | /**  | 
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| 197 | * Set the request content type.  | 
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| 198 | *  | 
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| 199 | * @param string $type  | 
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| 200 | * @return $this  | 
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| 201 | */  | 
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| 202 | public function contentType($type)  | 
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| 206 | |||
| 207 | /**  | 
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| 208 | * Set the request accept type.  | 
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| 209 | *  | 
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| 210 | * @param string $type  | 
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| 211 | * @return $this  | 
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| 212 | */  | 
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| 213 | public function accept($type)  | 
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| 217 | |||
| 218 | /**  | 
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| 219 | * Set the request accept type to "application/json".  | 
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| 220 | *  | 
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| 221 | * @return $this  | 
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| 222 | */  | 
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| 223 | public function acceptJson()  | 
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| 227 | |||
| 228 | /**  | 
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| 229 | * Specify where the body of the response will be saved.  | 
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| 230 | * Set the "sink" option.  | 
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| 231 | *  | 
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| 232 | * @param mixed $dest  | 
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| 233 | * @return $this  | 
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| 234 | */  | 
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| 235 | public function saveTo($dest)  | 
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| 239 | |||
| 240 | /**  | 
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| 241 | * Get the Guzzle response instance.  | 
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| 242 | *  | 
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| 243 | * @return \GuzzleHttp\Psr7\Response|null  | 
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| 244 | */  | 
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| 245 | public function getResponse()  | 
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| 249 | |||
| 250 | /**  | 
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| 251 | * Get data from the response.  | 
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| 252 | *  | 
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| 253 | * @param string|\Closure $callback  | 
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| 254 | * @param array $parameters  | 
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| 255 | * @param mixed $default  | 
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| 256 | * @return mixed  | 
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| 257 | */  | 
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| 258 | protected function getResponseData($callback, array $parameters = [], $default = null)  | 
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| 268 | |||
| 269 | /**  | 
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| 270 | * Get the response content.  | 
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| 271 | *  | 
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| 272 | * @return string  | 
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| 273 | */  | 
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| 274 | public function getContent()  | 
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| 278 | |||
| 279 | /**  | 
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| 280 | * Get the JSON-decoded response content.  | 
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| 281 | *  | 
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| 282 | * @param bool $assoc  | 
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| 283 | * @return mixed  | 
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| 284 | */  | 
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| 285 | public function getJsonContent($assoc = true)  | 
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| 286 |     { | 
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| 287 | return json_decode($this->getContent(), $assoc);  | 
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| 288 | }  | 
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| 289 | |||
| 290 | /**  | 
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| 291 | * Make request to a URI.  | 
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| 292 | *  | 
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| 293 | * @param string $uri  | 
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| 294 | * @param string $method  | 
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| 295 | * @param array $options  | 
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| 296 | * @return $this  | 
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| 297 | */  | 
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| 298 | public function request($uri = '', $method = 'GET', array $options = [])  | 
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| 315 | 2 | ||
| 316 | 2 | /**  | 
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| 317 | 2 | * Make request to a URI, expecting JSON content.  | 
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| 318 | *  | 
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| 319 | * @param string $uri  | 
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| 320 | * @param string $method  | 
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| 321 | * @param array $options  | 
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| 322 | 2 | * @return $this  | 
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| 323 | */  | 
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| 324 | public function requestJson($uri = '', $method = 'GET', array $options = [])  | 
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| 332 | |||
| 333 | /**  | 
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| 334 | * Add JSON type to the "Accept" header for the request options.  | 
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| 335 | *  | 
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| 336 | * @param array $options  | 
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| 337 | * @return array  | 
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| 338 | */  | 
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| 339 | protected function addAcceptableJsonType(array $options)  | 
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| 350 | |||
| 351 | /**  | 
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| 352 | * Request the URI and return the response content.  | 
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| 353 | *  | 
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| 354 | * @param string $uri  | 
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| 355 | * @param string $method  | 
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| 356 | * @param array $options  | 
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| 357 | * @return string  | 
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| 358 | */  | 
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| 359 | public function fetchContent($uri = '', $method = 'GET', array $options = [])  | 
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| 363 | |||
| 364 | /**  | 
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| 365 | * Request the URI and return the JSON-decoded response content.  | 
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| 366 | *  | 
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| 367 | * @param string $uri  | 
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| 368 | * @param string $method  | 
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| 369 | * @param array $options  | 
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| 370 | * @return mixed  | 
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| 371 | */  | 
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| 372 | public function fetchJson($uri = '', $method = 'GET', array $options = [])  | 
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| 376 | |||
| 377 | /**  | 
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| 378 | * Get all allowed magic request methods.  | 
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| 379 | *  | 
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| 380 | * @return array  | 
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| 381 | */  | 
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| 382 | protected function getMagicRequestMethods()  | 
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| 388 | |||
| 389 | /**  | 
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| 390 | * Get all allowed magic response methods.  | 
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| 391 | 2 | *  | 
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| 392 | * @return array  | 
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| 393 | */  | 
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| 394 | 2 | protected function getMagicResponseMethods()  | 
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| 401 | |||
| 402 | /**  | 
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| 403 | 1 | * Determine if the given method is a magic request method.  | 
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| 404 | *  | 
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| 405 | * @param string $method  | 
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| 406 | 1 | * @param string &$requestMethod  | 
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| 407 | 1 | * @param string &$httpMethod  | 
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| 408 | * @return bool  | 
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| 409 | */  | 
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| 410 | protected function isMagicRequest($method, &$requestMethod, &$httpMethod)  | 
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| 428 | |||
| 429 | 1 | /**  | 
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| 430 | * Get parameters for $this->request() from the magic request method.  | 
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| 431 | 1 | *  | 
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| 432 | * @param string $httpMethod  | 
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| 433 | 1 | * @param array $parameters  | 
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| 434 | * @return array  | 
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| 435 | */  | 
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| 436 | 1 | protected function getRequestParameters($httpMethod, array $parameters)  | 
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| 446 | |||
| 447 | /**  | 
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| 448 | * Handle magic method to send request, get response data, or set request options.  | 
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| 449 | 2 | *  | 
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| 450 | * @param string $method  | 
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| 451 | 2 | * @param array $parameters  | 
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| 452 | 1 | * @return mixed  | 
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| 453 | 1 | */  | 
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| 454 | 1 | public function __call($method, $parameters)  | 
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| 466 | }  | 
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| 467 | 
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.
Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..