0.0.1

src/Potter/Message/MessageBodyInterface.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Potter\Message;
+
+use \Psr\Http\Message\{
+    MessageInterface as PsrMessageInterface,
+    StreamInterface as PsrStreamInterface};
+
+interface MessageBodyInterface 
+{
+    public function getBody(): PsrStreamInterface;
+    public function withBody(StreamInterface $body): PsrMessageInterface;
+}

src/Potter/Message/MessageHeaderInterface.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Potter\Message;
+
+use \Psr\Http\Message\MessageInterface as PsrMessageInterface;
+
+interface MessageHeaderInterface 
+{
+    public function getHeaders(): array;
+    public function hasHeader(string $name): bool;
+    public function getHeader(string $name): array;
+    public function getHeaderLine(string $name): string;
+    public function withHeader(string $name, $value): PsrMessageInterface;
+    public function withAddedHeader(string $name, $value): PsrMessageInterface;
+    public function withoutHeader(string $name): PsrMessageInterface;
+}

src/Potter/Message/MessageInterface.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Potter\Message;
+
+use \Psr\Http\Message\MessageInterface as PsrMessageInterface;
+
+interface MessageInterface extends PsrMessageInterface,
+    MessageProtocolInterface, MessageHeaderInterface, MessageBodyInterface
+{ }

src/Potter/Message/MessageProtocolInterface.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Potter\Message;
+
+use \Psr\Http\Message\MessageInterface as PsrMessageInterface;
+
+interface MessageProtocolInterface 
+{
+    public function getProtocolVersion(): string;
+    public function withProtocolVersion(string $version): PsrMessageInterface;
+}