8297211: Expensive fillInStackTrace operation in HttpURLConnection.getOutputStream0 when no content-length in response

Backport-of: 392ac7055d4697c56fa85ac5572f5bc4dc431f1d

Author: Ben Taylor

src/java.base/share/classes/java/net/URLConnection.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1995, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1995, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -611,10 +611,12 @@ public Map<String,List<String>> getHeaderFields() {
      *          missing or malformed.
      */
     public int getHeaderFieldInt(String name, int Default) {
-        String value = getHeaderField(name);
-        try {
-            return Integer.parseInt(value);
-        } catch (Exception e) { }
+        final String value = getHeaderField(name);
+        if (value != null) {
+            try {
+                return Integer.parseInt(value);
+            } catch (NumberFormatException e) { }
+        }
         return Default;
     }
 
@@ -634,10 +636,12 @@ public int getHeaderFieldInt(String name, int Default) {
      * @since 1.7
      */
     public long getHeaderFieldLong(String name, long Default) {
-        String value = getHeaderField(name);
-        try {
-            return Long.parseLong(value);
-        } catch (Exception e) { }
+        final String value = getHeaderField(name);
+        if (value != null) {
+            try {
+                return Long.parseLong(value);
+            } catch (NumberFormatException e) { }
+        }
         return Default;
     }
 
@@ -659,10 +663,12 @@ public long getHeaderFieldLong(String name, long Default) {
      */
     @SuppressWarnings("deprecation")
     public long getHeaderFieldDate(String name, long Default) {
-        String value = getHeaderField(name);
-        try {
-            return Date.parse(value);
-        } catch (Exception e) { }
+        final String value = getHeaderField(name);
+        if (value != null) {
+            try {
+                return Date.parse(value);
+            } catch (Exception e) { }
+        }
         return Default;
     }
 

src/java.base/share/classes/sun/net/www/protocol/http/HttpURLConnection.java

@@ -1938,9 +1938,12 @@ private InputStream getInputStream0() throws IOException {
                     continue;
                 }
 
-                try {
-                    cl = Long.parseLong(responses.findValue("content-length"));
-                } catch (Exception exc) { };
+                final String contentLengthVal = responses.findValue("content-length");
+                if (contentLengthVal != null) {
+                    try {
+                        cl = Long.parseLong(contentLengthVal);
+                    } catch (NumberFormatException nfe) { }
+                }
 
                 if (method.equals("HEAD") || cl == 0 ||
                     respCode == HTTP_NOT_MODIFIED ||