From 0ca0bc96454efc521950fe387300af33414a444d Mon Sep 17 00:00:00 2001
From: Maxim Ivanitskiy <m.ivanitskiy@f5.com>
Date: Thu, 31 Aug 2023 12:17:23 -0700
Subject: [PATCH] fix: check user_agent for null

---
 src/http/request.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/http/request.rs b/src/http/request.rs
index 7d12532..b302819 100644
--- a/src/http/request.rs
+++ b/src/http/request.rs
@@ -211,8 +211,12 @@ impl Request {
     /// Client HTTP [User-Agent].
     ///
     /// [User-Agent]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent
-    pub fn user_agent(&self) -> &NgxStr {
-        unsafe { NgxStr::from_ngx_str((*self.0.headers_in.user_agent).value) }
+    pub fn user_agent(&self) -> Option<&NgxStr> {
+        if !self.0.headers_in.user_agent.is_null() {
+            unsafe { Some(NgxStr::from_ngx_str((*self.0.headers_in.user_agent).value)) }
+        } else {
+            None
+        }
     }
 
     /// Set HTTP status of response.