diff --git a/dlls/winhttp/request.c b/dlls/winhttp/request.c
index 2053c96c53..2a2d4036ee 100644
--- a/dlls/winhttp/request.c
+++ b/dlls/winhttp/request.c
@@ -2515,15 +2515,6 @@ static HRESULT WINAPI winhttp_request_SetRequestHeader(
     return E_NOTIMPL;
 }
 
-static HRESULT WINAPI winhttp_request_GetResponseHeader(
-    IWinHttpRequest *iface,
-    BSTR header,
-    BSTR *value )
-{
-    FIXME("\n");
-    return E_NOTIMPL;
-}
-
 static DWORD wait_for_completion( struct winhttp_request *request, DWORD timeout )
 {
     HANDLE handles[2];
@@ -2591,6 +2582,37 @@ static DWORD request_wait_for_response( struct winhttp_request *request, DWORD t
     return wait_for_completion( request, timeout );
 }
 
+static HRESULT WINAPI winhttp_request_GetResponseHeader(
+    IWinHttpRequest *iface,
+    BSTR header,
+    BSTR *value )
+{
+    struct winhttp_request *request = impl_from_IWinHttpRequest( iface );
+    DWORD err, size;
+
+    TRACE("%p, %p\n", request, header);
+
+    if (request->state < REQUEST_STATE_SENT)
+    {
+        return HRESULT_FROM_WIN32( ERROR_WINHTTP_CANNOT_CALL_BEFORE_SEND );
+    }
+    if (!header || !value) return E_INVALIDARG;
+    if ((err = request_wait_for_response( request, INFINITE ))) return HRESULT_FROM_WIN32( err );
+    request->state = REQUEST_STATE_RESPONSE_RECEIVED;
+
+    size = 0;
+    WinHttpQueryHeaders( request->hrequest, WINHTTP_QUERY_CUSTOM, header, NULL, &size, NULL );
+    err = get_last_error();
+    if (err != ERROR_INSUFFICIENT_BUFFER) return HRESULT_FROM_WIN32( err );
+    if (!(*value = SysAllocStringLen( NULL, size / sizeof(WCHAR) ))) return E_OUTOFMEMORY;
+    if (!WinHttpQueryHeaders( request->hrequest, WINHTTP_QUERY_CUSTOM, header, *value, &size, NULL ))
+    {
+        SysFreeString( *value );
+        return HRESULT_FROM_WIN32( get_last_error() );
+    }
+    return S_OK;
+}
+
 static HRESULT WINAPI winhttp_request_GetAllResponseHeaders(
     IWinHttpRequest *iface,
     BSTR *headers )
diff --git a/dlls/winhttp/tests/winhttp.c b/dlls/winhttp/tests/winhttp.c
index e3f1fb6a6b..0f932b311c 100644
--- a/dlls/winhttp/tests/winhttp.c
+++ b/dlls/winhttp/tests/winhttp.c
@@ -2112,9 +2112,11 @@ static void test_IWinHttpRequest(void)
     static const WCHAR method2W[] = {'I','N','V','A','L','I','D',0};
     static const WCHAR proxy_serverW[] = {'p','r','o','x','y','s','e','r','v','e','r',0};
     static const WCHAR bypas_listW[] = {'b','y','p','a','s','s','l','i','s','t',0};
+    static const WCHAR connectionW[] = {'C','o','n','n','e','c','t','i','o','n',0};
     HRESULT hr;
     IWinHttpRequest *req;
     BSTR method, url, username, password, response = NULL, status_text = NULL, headers = NULL;
+    BSTR connection, value = NULL;
     VARIANT async, empty, timeout, body, proxy_server, bypass_list;
     VARIANT_BOOL succeeded;
     LONG status;
@@ -2236,6 +2238,16 @@ static void test_IWinHttpRequest(void)
     hr = IWinHttpRequest_GetAllResponseHeaders( req, &headers );
     ok( hr == HRESULT_FROM_WIN32( ERROR_WINHTTP_CANNOT_CALL_BEFORE_SEND ), "got %08x\n", hr );
 
+    hr = IWinHttpRequest_GetResponseHeader( req, NULL, NULL );
+    ok( hr == HRESULT_FROM_WIN32( ERROR_WINHTTP_CANNOT_CALL_BEFORE_SEND ), "got %08x\n", hr );
+
+    connection = SysAllocString( connectionW );
+    hr = IWinHttpRequest_GetResponseHeader( req, connection, NULL );
+    ok( hr == HRESULT_FROM_WIN32( ERROR_WINHTTP_CANNOT_CALL_BEFORE_SEND ), "got %08x\n", hr );
+
+    hr = IWinHttpRequest_GetResponseHeader( req, connection, &value );
+    ok( hr == HRESULT_FROM_WIN32( ERROR_WINHTTP_CANNOT_CALL_BEFORE_SEND ), "got %08x\n", hr );
+
     SysFreeString( method );
     method = SysAllocString( method1W );
     SysFreeString( url );
@@ -2297,6 +2309,9 @@ static void test_IWinHttpRequest(void)
     hr = IWinHttpRequest_GetAllResponseHeaders( req, &headers );
     ok( hr == HRESULT_FROM_WIN32( ERROR_WINHTTP_CANNOT_CALL_BEFORE_SEND ), "got %08x\n", hr );
 
+    hr = IWinHttpRequest_GetResponseHeader( req, connection, &value );
+    ok( hr == HRESULT_FROM_WIN32( ERROR_WINHTTP_CANNOT_CALL_BEFORE_SEND ), "got %08x\n", hr );
+
     hr = IWinHttpRequest_Send( req, empty );
     ok( hr == S_OK, "got %08x\n", hr );
 
@@ -2345,6 +2360,16 @@ static void test_IWinHttpRequest(void)
     ok( hr == S_OK, "got %08x\n", hr );
     SysFreeString( headers );
 
+    hr = IWinHttpRequest_GetResponseHeader( req, NULL, NULL );
+    ok( hr == E_INVALIDARG, "got %08x\n", hr );
+
+    hr = IWinHttpRequest_GetResponseHeader( req, connection, NULL );
+    ok( hr == E_INVALIDARG, "got %08x\n", hr );
+
+    hr = IWinHttpRequest_GetResponseHeader( req, connection, &value );
+    ok( hr == S_OK, "got %08x\n", hr );
+    SysFreeString( value );
+
     VariantInit( &timeout );
     V_VT( &timeout ) = VT_I4;
     V_I4( &timeout ) = 10;
@@ -2399,6 +2424,10 @@ static void test_IWinHttpRequest(void)
     ok( hr == S_OK, "got %08x\n", hr );
     SysFreeString( headers );
 
+    hr = IWinHttpRequest_GetResponseHeader( req, connection, &value );
+    ok( hr == S_OK, "got %08x\n", hr );
+    SysFreeString( value );
+
     hr = IWinHttpRequest_Send( req, empty );
     ok( hr == S_OK, "got %08x\n", hr );