Fix CSV export timing columns and add units to headers

Corrects CSV export to properly include timing data by accessing nested timing properties and calculating derived values like DNS time, connection time, and data rate. Headers now include units (μs, bytes, bytes/sec) for clarity.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/httprequestviewer/lib/csvExport.ts

@@ -14,14 +14,14 @@ const DEFAULT_COLUMNS = [
   'priority',
   'protocol',
   'connectionNumber',
-  'requestNumber',
-  'startTime',
-  'queueTime',
+  'requestNumberOnConnection',
+  'timing.start',
+  'timing.queueTime',
   'dnsTime',
   'connectionTime',
-  'serverLatency',
-  'duration',
-  'totalResponseTime',
+  'timing.serverLatency',
+  'timing.duration',
+  'timing.totalResponseTime',
   'dataRate',
   'size',
   'contentLength',
@@ -55,6 +55,34 @@ const formatCSVValue = (value: any): string => {
   return stringValue
 }
 
+// Calculate derived values for CSV export
+const calculateDerivedValue = (request: HTTPRequest, path: string): any => {
+  switch (path) {
+    case 'dnsTime':
+      if (request.timing.dnsStart !== undefined && request.timing.dnsEnd !== undefined && 
+          request.timing.dnsStart >= 0 && request.timing.dnsEnd >= 0) {
+        return request.timing.dnsEnd - request.timing.dnsStart
+      }
+      return null
+    case 'connectionTime':
+      if (request.timing.connectStart !== undefined && request.timing.connectEnd !== undefined && 
+          request.timing.connectStart >= 0 && request.timing.connectEnd >= 0) {
+        return request.timing.connectEnd - request.timing.connectStart
+      }
+      return null
+    case 'dataRate':
+      if (!request.timing.duration || request.timing.duration <= 0) return null
+      const bytes = request.contentLength && request.contentLength > 0 ? request.contentLength : request.encodedDataLength
+      if (!bytes) return null
+      const durationSeconds = request.timing.duration / 1000000
+      return bytes / durationSeconds // bytes per second
+    case 'size':
+      return request.encodedDataLength || request.contentLength || null
+    default:
+      return getNestedValue(request, path)
+  }
+}
+
 // Get nested property value from object
 const getNestedValue = (obj: any, path: string): any => {
   return path.split('.').reduce((current, key) => {
@@ -81,12 +109,40 @@ export const exportRequestsToCSV = (
   // Add headers if requested
   if (includeHeaders) {
     const headers = selectedColumns.map(col => {
-      // Clean up column names for headers
+      // Add units to timing-related headers
+      switch (col) {
+        case 'timing.start':
+          return 'Start Time (μs)'
+        case 'timing.queueTime':
+          return 'Queue Time (μs)'
+        case 'dnsTime':
+          return 'DNS Time (μs)'
+        case 'connectionTime':
+          return 'Connection Time (μs)'
+        case 'timing.serverLatency':
+          return 'Server Latency (μs)'
+        case 'timing.duration':
+          return 'Duration (μs)'
+        case 'timing.totalResponseTime':
+          return 'Total Response Time (μs)'
+        case 'timing.downloadTime':
+          return 'Download Time (μs)'
+        case 'dataRate':
+          return 'Data Rate (bytes/sec)'
+        case 'size':
+          return 'Size (bytes)'
+        case 'contentLength':
+          return 'Content Length (bytes)'
+        case 'encodedDataLength':
+          return 'Encoded Data Length (bytes)'
+        default:
+          // Clean up column names for other headers
           return col
             .replace(/([A-Z])/g, ' $1') // Add space before capitals
             .replace(/^\w/, c => c.toUpperCase()) // Capitalize first letter
             .replace(/\./g, ' ') // Replace dots with spaces
             .trim()
+      }
     })
     lines.push(headers.map(formatCSVValue).join(','))
   }
@@ -94,7 +150,7 @@ export const exportRequestsToCSV = (
   // Add data rows
   for (const request of requests) {
     const values = selectedColumns.map(column => {
-      const value = getNestedValue(request, column)
+      const value = calculateDerivedValue(request, column)
       return formatCSVValue(value)
     })
     lines.push(values.join(','))