code: public WikiPageDetail getWikiPageDetailByProjectAndTitle(String projectKey, String pageTitle) throws RedmineException {
          String urlSafeString = WikiPageDetail.getUrlSafeString(pageTitle);
          WikiPageDetail wikiPageDetail = transport.getChildEntry(Project.class, projectKey, WikiPageDetail.class, urlSafeString, new BasicNameValuePair("include", "attachments"));
          // Redmine REST API does not provide projectKey in response, so...
          wikiPageDetail.setProjectKey(projectKey);
          return wikiPageDetail;
      }
docs: @param projectKey the key of the project (like "TEST-12") we want the wiki page from
  @param pageTitle   The name of the page
  
  @return the wiki page titled with the name passed as parameter
  
  @since Redmine 2.2