--- /dev/null
+# http\Client\Request http\Client\Request::setContentType(string $content_type)
+
+Set the MIME content type of the request message.
+
+## Params:
+
+* string $content_type
+ The MIME type used as "Content-Type".
+
+## Returns:
+
+* http\Client\Request, self.
+
+
+## Errors:
+
+* HTTP_E_INVALID_PARAM, if $content_type does not follow the general "primary/secondary" notation.