fix bugs

hutool-http/src/main/java/cn/hutool/http/HttpRequest.java

@@ -1236,7 +1236,20 @@ public class HttpRequest extends HttpBase<HttpRequest> {
 
 			if (responseCode != HttpURLConnection.HTTP_OK) {
 				if (HttpStatus.isRedirected(responseCode)) {
-					setUrl(UrlBuilder.ofHttpWithoutEncode(httpConnection.header(Header.LOCATION)));
+					final UrlBuilder redirectUrl;
+					String location = httpConnection.header(Header.LOCATION);
+					if(false == HttpUtil.isHttp(location) && false == HttpUtil.isHttps(location)){
+						// issue#I5TPSY
+						// location可能为相对路径
+						if(false == location.startsWith("/")){
+							location = StrUtil.addSuffixIfNot(this.url.getPathStr(), "/") + location;
+						}
+						redirectUrl = UrlBuilder.of(this.url.getScheme(), this.url.getHost(), this.url.getPort()
+								, location, null, null, this.charset);
+					} else{
+						redirectUrl = UrlBuilder.ofHttpWithoutEncode(location);
+					}
+					setUrl(redirectUrl);
 					if (redirectCount < config.maxRedirectCount) {
 						redirectCount++;
 						// 重定向不再走过滤器

hutool-http/src/test/java/cn/hutool/http/IssueI5TPSYTest.java

@@ -0,0 +1,19 @@
+package cn.hutool.http;
+
+import cn.hutool.core.lang.Console;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import java.net.HttpCookie;
+
+public class IssueI5TPSYTest {
+	@Test
+	@Ignore
+	public void redirectTest() {
+		final String url = "https://bsxt.gdzwfw.gov.cn/UnifiedReporting/auth/newIndex";
+		final HttpResponse res = HttpUtil.createGet(url).setFollowRedirects(true)
+				.cookie(new HttpCookie("iPlanetDirectoryPro", "123"))
+				.execute();
+		Console.log(res.body());
+	}
+}