Fix Azure#25255. (Azure#25595)

Author: Rujun Chen

sdk/keyvault/azure-security-keyvault-jca/src/main/java/com/azure/security/keyvault/jca/implementation/utils/HttpUtil.java

@@ -10,6 +10,7 @@
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.config.RegistryBuilder;
 import org.apache.http.conn.socket.ConnectionSocketFactory;
+import org.apache.http.conn.socket.PlainConnectionSocketFactory;
 import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
 import org.apache.http.entity.ContentType;
 import org.apache.http.entity.StringEntity;
@@ -129,6 +130,7 @@ private static CloseableHttpClient buildClient() {
 
         PoolingHttpClientConnectionManager manager = new PoolingHttpClientConnectionManager(
             RegistryBuilder.<ConnectionSocketFactory>create()
+                .register("http", PlainConnectionSocketFactory.getSocketFactory())
                 .register("https", sslConnectionSocketFactory)
                 .build());
         return HttpClients.custom().setConnectionManager(manager).build();

sdk/keyvault/azure-security-keyvault-jca/src/test/java/com/azure/security/keyvault/jca/implementation/utils/HttpUtilTest.java

@@ -20,10 +20,19 @@ public void getUserAgentPrefixTest() {
 
     @Test
     @Disabled("Disable this because it will cause pipeline failure: https://dev.azure.com/azure-sdk/internal/_build/results?buildId=1196171&view=logs&j=4a83f3be-c53d-53dd-7954-86872056fb11&t=54174aae-5a55-579d-08e2-94fb446f7b77&l=29")
-    public void testCustomizedHttpsClient() {
+    public void testHttpUtilGet() {
         String url = "https://mvnrepository.com/";
         String result = HttpUtil.get(url, null);
         assertNotNull(result);
         assertFalse(result.isEmpty());
     }
+
+    @Test
+    @Disabled("This is only used to test in localhost manually")
+    public void testHttpUtilGet1() {
+        String url = "http://localhost:8000/";
+        String result = HttpUtil.get(url, null);
+        assertNotNull(result);
+        assertFalse(result.isEmpty());
+    }
 }