Fix NSURLSession header fields not always being matched case insensitive.

ChangeLog

@@ -1,3 +1,11 @@
+2023-01-13 Frederik Seiffert <frederik@algoriddim.com>
+
+	* Source/Additions/GSInsensitiveDictionary.m:
+	* Source/NSURLRequest.m:
+	* Source/NSURLResponse.m:
+	Fix NSURLSession header fields not always being matched case
+	insensitive.
+
 2023-01-13 Frederik Seiffert <frederik@algoriddim.com>
 
 	* Source/GSEasyHandle.m:

Source/Additions/GSInsensitiveDictionary.m

@@ -378,6 +378,13 @@ static SEL	objSel;
   return [copy initWithDictionary: self copyItems: NO];
 }
 
+- (id) mutableCopyWithZone: (NSZone*)z
+{
+  NSMutableDictionary	*copy = [_GSMutableInsensitiveDictionary allocWithZone: z];
+
+  return [copy initWithDictionary: self copyItems: NO];
+}
+
 - (id) init
 {
   return [self initWithCapacity: 0];

Source/Additions/GSMime.m

@@ -3345,7 +3345,6 @@ unfold(const unsigned char *src, const unsigned char *end, BOOL *folded)
 
 @end
 
-
 
 @interface	_GSMutableInsensitiveDictionary : NSMutableDictionary
 @end

Source/NSURLRequest.m

@@ -118,7 +118,7 @@ typedef struct {
 	  inst->shouldHandleCookies = this->shouldHandleCookies;
 	  inst->debug = this->debug;
 	  inst->ioDelegate = this->ioDelegate;
-          inst->headers = [this->headers mutableCopy];
+	  inst->headers = [this->headers mutableCopy];
 	}
     }
   return o;

Source/NSURLResponse.m

@@ -284,8 +284,15 @@ typedef struct {
 	  textEncodingName: nil];
   if (nil != self)
     {
+      NSString *k;
+      NSEnumerator *e = [headerFields keyEnumerator];
+      while (nil != (k = [e nextObject]))
+        {
+          NSString *v = [headerFields objectForKey: k];
+          [self _setValue: v forHTTPHeaderField: k];
+        }
+
       this->statusCode = statusCode;
-      this->headers = [headerFields copy];
       [self _checkHeaders];
     }
   return self;