fix: preserve blank lines when copying HTTP packets

web/src/components/http-code-block.tsx

@@ -111,6 +111,40 @@ function HighlightedBody({ body, format }: { body: string; format: BodyFormat })
   return body;
 }
 
+// Empty grid rows have no text, so native selection copying drops their newlines.
+// Map the selected DOM boundaries back to the raw packet instead.
+function selectedPacketText(container: HTMLElement, value: string, lines: string[]): string | null {
+  const selection = window.getSelection();
+  if (!selection || selection.isCollapsed || selection.rangeCount !== 1) return null;
+  const range = selection.getRangeAt(0);
+  if (!container.contains(range.startContainer) || !container.contains(range.endContainer)) return null;
+
+  let start: number | null = null;
+  let end: number | null = null;
+  let offset = 0;
+  container.querySelectorAll("[data-line] code").forEach((code, index) => {
+    if (range.intersectsNode(code)) {
+      const selected = document.createRange();
+      selected.selectNodeContents(code);
+      if (range.compareBoundaryPoints(Range.START_TO_START, selected) > 0) {
+        selected.setStart(range.startContainer, range.startOffset);
+      }
+      if (range.compareBoundaryPoints(Range.END_TO_END, selected) < 0) {
+        selected.setEnd(range.endContainer, range.endOffset);
+      }
+      const prefix = document.createRange();
+      prefix.selectNodeContents(code);
+      prefix.setEnd(selected.startContainer, selected.startOffset);
+      start ??= offset + prefix.toString().length;
+      prefix.setEnd(selected.endContainer, selected.endOffset);
+      end = offset + prefix.toString().length;
+    }
+    const lineEnd = offset + lines[index].length;
+    offset = lineEnd + (value[lineEnd] === "\r" ? 2 : 1);
+  });
+  return start !== null && end !== null ? value.slice(start, end) : null;
+}
+
 export function HttpCodeBlock({ raw }: { raw: string }) {
   const [wrapLines, setWrapLines] = React.useState(true);
   const [copied, setCopied] = React.useState(false);
@@ -183,6 +217,12 @@ export function HttpCodeBlock({ raw }: { raw: string }) {
         aria-readonly="true"
         tabIndex={0}
         className="max-h-[calc(100vh-15rem)] min-w-0 overflow-auto bg-background py-3 font-mono text-xs outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-ring"
+        onCopy={(event) => {
+          const text = selectedPacketText(event.currentTarget, value, lines);
+          if (text === null) return;
+          event.preventDefault();
+          event.clipboardData.setData("text/plain", text);
+        }}
         onKeyDown={(event) => {
           if (!(event.ctrlKey || event.metaKey) || event.key.toLowerCase() !== "a") return;
           event.preventDefault();