diff --git a/include/crow/http_connection.h b/include/crow/http_connection.h
index 2300757fe..9ff03ee36 100644
--- a/include/crow/http_connection.h
+++ b/include/crow/http_connection.h
@@ -419,32 +419,73 @@ namespace crow
             }
 
             static std::unordered_map<int, std::string> statusCodes = {
+                {100, "HTTP/1.1 100 Continue\r\n"},
+                {101, "HTTP/1.1 101 Switching Protocols\r\n"},
+                {102, "HTTP/1.1 102 Processing\r\n"},
+                {103, "HTTP/1.1 103 Early Hints\r\n"},
+
                 {200, "HTTP/1.1 200 OK\r\n"},
                 {201, "HTTP/1.1 201 Created\r\n"},
                 {202, "HTTP/1.1 202 Accepted\r\n"},
+                {203, "HTTP/1.1 203 Non-Authoritative Information\r\n"},
                 {204, "HTTP/1.1 204 No Content\r\n"},
+                {205, "HTTP/1.1 205 Reset Content\r\n"},
+                {206, "HTTP/1.1 206 Partial Content\r\n"},
+                {207, "HTTP/1.1 207 Multi-Status\r\n"},
+                {208, "HTTP/1.1 208 Already Reported\r\n"},
+                {226, "HTTP/1.1 226 IM Used\r\n"},
 
                 {300, "HTTP/1.1 300 Multiple Choices\r\n"},
                 {301, "HTTP/1.1 301 Moved Permanently\r\n"},
                 {302, "HTTP/1.1 302 Found\r\n"},
                 {303, "HTTP/1.1 303 See Other\r\n"},
                 {304, "HTTP/1.1 304 Not Modified\r\n"},
+                {305, "HTTP/1.1 305 Use Proxy\r\n"},
+                {306, "HTTP/1.1 306 Switch Proxy\r\n"},
                 {307, "HTTP/1.1 307 Temporary Redirect\r\n"},
                 {308, "HTTP/1.1 308 Permanent Redirect\r\n"},
 
                 {400, "HTTP/1.1 400 Bad Request\r\n"},
                 {401, "HTTP/1.1 401 Unauthorized\r\n"},
+                {402, "HTTP/1.1 402 Payment Required\r\n"},
                 {403, "HTTP/1.1 403 Forbidden\r\n"},
                 {404, "HTTP/1.1 404 Not Found\r\n"},
                 {405, "HTTP/1.1 405 Method Not Allowed\r\n"},
+                {406, "HTTP/1.1 406 Not Acceptable\r\n"},
+                {407, "HTTP/1.1 407 Proxy Authentication Required\r\n"},
+                {408, "HTTP/1.1 408 Request Timeout\r\n"},
+                {409, "HTTP/1.1 409 Conflict\r\n"},
+                {410, "HTTP/1.1 410 Gone\r\n"},
+                {411, "HTTP/1.1 411 Length Required\r\n"},
+                {412, "HTTP/1.1 412 Precondition Failed\r\n"},
                 {413, "HTTP/1.1 413 Payload Too Large\r\n"},
+                {414, "HTTP/1.1 414 URI Too Long\r\n"},
+                {415, "HTTP/1.1 415 Unsupported Media Type\r\n"},
+                {416, "HTTP/1.1 416 Range Not Satisfiable\r\n"},
+                {417, "HTTP/1.1 417 Expectation Failed\r\n"},
+                {418, "HTTP/1.1 418 I'm a teapot\r\n"},
+                {421, "HTTP/1.1 421 Misdirected Request\r\n"},
                 {422, "HTTP/1.1 422 Unprocessable Entity\r\n"},
+                {423, "HTTP/1.1 423 Locked\r\n"},
+                {424, "HTTP/1.1 424 Failed Dependency\r\n"},
+                {425, "HTTP/1.1 425 Too Early\r\n"},
+                {426, "HTTP/1.1 426 Upgrade Required\r\n"},
+                {428, "HTTP/1.1 428 Precondition Required\r\n"},
                 {429, "HTTP/1.1 429 Too Many Requests\r\n"},
+                {431, "HTTP/1.1 431 Request Header Fields Too Large\r\n"},
+                {451, "HTTP/1.1 451 Unavailable For Legal Reasons\r\n"},
 
                 {500, "HTTP/1.1 500 Internal Server Error\r\n"},
                 {501, "HTTP/1.1 501 Not Implemented\r\n"},
                 {502, "HTTP/1.1 502 Bad Gateway\r\n"},
                 {503, "HTTP/1.1 503 Service Unavailable\r\n"},
+                {504, "HTTP/1.1 504 Gateway Timeout\r\n"},
+                {505, "HTTP/1.1 505 HTTP Version Not Supported\r\n"},
+                {506, "HTTP/1.1 506 Variant Also Negotiates\r\n"},
+                {507, "HTTP/1.1 507 Insufficient Storage\r\n"},
+                {508, "HTTP/1.1 508 Loop Detected\r\n"},
+                {510, "HTTP/1.1 510 Not Extended\r\n"},
+                {511, "HTTP/1.1 511 Network Authentication Required\r\n"},
             };
 
             static std::string seperator = ": ";