Deprecated HttpClient service, added ClientInterface

Fixes php-http#425

Author: Ivan Kurnosov

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 The change log describes what is "Added", "Removed", "Changed" or "Fixed" between each release.
 
+# unreleased
+
+- Marked `Http\Client\HttpClient` service as deprecated (#425).
+- Added `Psr\Http\Client\ClientInterface` service (#425).
+
 # 1.27.1 - 2023-03-03
 
 - Added `: void` to `Collector::reset` to avoid PHP warning.

src/Resources/config/services.xml

@@ -47,7 +47,10 @@
         <service id="httplug.client.default" class="Http\Client\HttpClient">
             <factory class="Http\Discovery\HttpClientDiscovery" method="find" />
         </service>
-        <service id="Http\Client\HttpClient" alias="httplug.client" public="false" />
+        <service id="Http\Client\HttpClient" alias="httplug.client" public="false">
+            <deprecated />
+        </service>
+        <service id="Psr\Http\Client\ClientInterface" alias="httplug.client" public="false" />
 
         <!-- Discovery for PSR-18 -->
         <service id="httplug.psr18_client.default" class="Psr\Http\Client\ClientInterface">