From 286bf219580806cbc5c0ae31b24bba62bc2c39aa Mon Sep 17 00:00:00 2001
From: discollizard <discollizard@github.com>
Date: Tue, 29 Jul 2025 22:26:32 -0300
Subject: [PATCH 1/3] implementation

---
 lib/inc/drogon/HttpRequest.h |  7 +++++++
 lib/src/HttpRequestImpl.h    | 17 +++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/lib/inc/drogon/HttpRequest.h b/lib/inc/drogon/HttpRequest.h
index 24d8c7579d..ecdffd31dd 100644
--- a/lib/inc/drogon/HttpRequest.h
+++ b/lib/inc/drogon/HttpRequest.h
@@ -159,6 +159,13 @@ class DROGON_EXPORT HttpRequest
      */
     virtual void removeHeader(std::string key) = 0;
 
+    /**
+     * @brief  Clears the value in the header identified by the key parameter.
+     *
+     * @param key The key is case insensitive
+     */
+    virtual void clearHeader(std::string key) = 0;
+
     /// Get the cookie string identified by the field parameter
     virtual const std::string &getCookie(const std::string &field) const = 0;
 
diff --git a/lib/src/HttpRequestImpl.h b/lib/src/HttpRequestImpl.h
index 966ef92b78..68c82a9079 100644
--- a/lib/src/HttpRequestImpl.h
+++ b/lib/src/HttpRequestImpl.h
@@ -351,6 +351,23 @@ class HttpRequestImpl : public HttpRequest
         headers_.erase(lowerKey);
     }
 
+    void clearHeader(std::string key) override
+    {
+        transform(key.begin(), key.end(), key.begin(), [](unsigned char c) {
+            return tolower(c);
+        });
+        clearHeaderBy(key);
+    }
+
+    void clearHeaderBy(const std::string &lowerKey)
+    {
+        auto it = headers_.find(lowerKey);
+        if (it != headers_.end())
+        {
+            it->second = "";
+        }
+    }
+
     const std::string &getHeader(std::string field) const override
     {
         std::transform(field.begin(),

From 9f4b0e86e30be5ef789d7d09ce66ea17d5d76b90 Mon Sep 17 00:00:00 2001
From: discollizard <discollizard@github.com>
Date: Tue, 29 Jul 2025 22:27:12 -0300
Subject: [PATCH 2/3] tests

---
 lib/tests/unittests/HttpHeaderTest.cc | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lib/tests/unittests/HttpHeaderTest.cc b/lib/tests/unittests/HttpHeaderTest.cc
index 4a46bb193a..c819400e93 100644
--- a/lib/tests/unittests/HttpHeaderTest.cc
+++ b/lib/tests/unittests/HttpHeaderTest.cc
@@ -12,8 +12,20 @@ DROGON_TEST(HttpHeaderRequest)
     CHECK(req->getHeader("Abc") == "abc");
     CHECK(req->getHeader("abc") == "abc");
 
+    // removing header
     req->removeHeader("Abc");
     CHECK(req->getHeader("abc") == "");
+
+    req->addHeader("Def", "def");
+    CHECK(req->getHeader("Def") == "def");
+
+    auto it = req->headers().find("def");
+    const std::string *original_ptr = &it->second;
+
+    //clearing header, but reusing memory
+    req->clearHeader("Def");
+    CHECK(req->getHeader("def") == "");
+    CHECK(&req->getHeader("def") == original_ptr);
 }
 
 DROGON_TEST(HttpHeaderResponse)

From a48ecfe8663874cb3b6adf920a7dcb2078dabc37 Mon Sep 17 00:00:00 2001
From: discollizard <discollizard@github.com>
Date: Tue, 29 Jul 2025 22:35:43 -0300
Subject: [PATCH 3/3] ran clang-format

---
 lib/tests/unittests/HttpHeaderTest.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/tests/unittests/HttpHeaderTest.cc b/lib/tests/unittests/HttpHeaderTest.cc
index c819400e93..b693a25c57 100644
--- a/lib/tests/unittests/HttpHeaderTest.cc
+++ b/lib/tests/unittests/HttpHeaderTest.cc
@@ -22,7 +22,7 @@ DROGON_TEST(HttpHeaderRequest)
     auto it = req->headers().find("def");
     const std::string *original_ptr = &it->second;
 
-    //clearing header, but reusing memory
+    // clearing header, but reusing memory
     req->clearHeader("Def");
     CHECK(req->getHeader("def") == "");
     CHECK(&req->getHeader("def") == original_ptr);