Handle empty header value and linear whitespace

Fixes #131

Author: mfikes

Replete/http.c

@@ -53,12 +53,40 @@ size_t header_to_object_callback(char *buffer, size_t size, size_t nitems, void
 
     JSStringRef key_str = JSStringCreateWithUTF8CString(key);
 
-    int val_start = key_end + 2;
-    size_t val_len = val_end - val_start;
-    char val[val_len + 1];
-    strncpy(val, buffer + val_start, val_len);
-    val[val_len] = '\0';
-    JSStringRef val_str = JSStringCreateWithUTF8CString(val);
+    int val_start = key_end + 1;
+    
+    // Trim whitespace from beginning of val
+    for (i = val_start; i < val_end; i++) {
+        if (buffer[i] == ' ' || buffer[i] == '\t') {
+            val_start++;
+        } else {
+            break;
+        }
+     }
+    
+    // Trim whitespace from end of val
+    for (i = val_end - 1; i > val_start; i--) {
+        if (buffer[i] == ' ' || buffer[i] == '\t') {
+            val_end--;
+        } else {
+            break;
+        }
+    }
+    
+    size_t val_len;
+    JSStringRef val_str;
+    
+    if (val_start < val_end) {
+        val_len = val_end - val_start;
+        char val[val_len + 1];
+        strncpy(val, buffer + val_start, val_len);
+        val[val_len] = '\0';
+        val_str = JSStringCreateWithUTF8CString(val);
+    } else {
+          char val[1];
+          val[0] = '\0';
+          val_str = JSStringCreateWithUTF8CString(val);
+    }
     JSValueRef val_ref = JSValueMakeString(ctx, val_str);
 
     JSObjectSetProperty(ctx, *state->headers, key_str, val_ref, kJSPropertyAttributeReadOnly, NULL);