@Test
  void slashShouldNotBeAppendedForMatrixParams() {
    RequestTemplate template =
        new RequestTemplate().method(HttpMethod.GET).uri("/path;key1=value1;key2=value2", true);

    assertThat(template.url()).isEqualTo("/path;key1=value1;key2=value2");
  }
Implementations have a bug if they pass junk as the http method.
core/src/test/java/feign/RequestTemplateTest.java