Allow remote files upload (CORS)

Implement preflighted requests (OPTIONS) to allow remote files upload
(CORS).

-
https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS#Preflighted_requests

- https://www.w3.org/TR/cors/

src/libs/Network/uip/webserver/http-strings

@@ -18,6 +18,7 @@ http_crnl "\r\n"
 http_index_html "/index.html"
 http_404_html "/404.html"
 http_referer "Referer:"
+http_header_preflight "HTTP/1.0 200 OK\r\nServer: uIP/1.0\r\nConnection: Keep-Alive\r\nAccess-Control-Allow-Origin: *\r\nAccess-Control-Allow-Methods: POST, GET, OPTIONS\r\nAccess-Control-Allow-Headers: X-Filename, Content-Type, Pragma, Cache-Control\r\nAccess-Control-Max-Age: 86400\r\n"
 http_header_200 "HTTP/1.0 200 OK\r\nServer: uIP/1.0\r\nAccess-Control-Allow-Origin: *\r\nConnection: close\r\n"
 http_header_304 "HTTP/1.0 304 Not Modified\r\nServer: uIP/1.0\r\nAccess-Control-Allow-Origin: *\r\nConnection: close\r\nExpires: Thu, 31 Dec 2037 23:55:55 GMT\r\nCache-Control: max-age=315360000\r\nX-Cache: HIT\r\n"
 http_header_404 "HTTP/1.0 404 Not found\r\nServer: uIP/1.0\r\nAccess-Control-Allow-Origin: *\r\nConnection: close\r\n"

src/libs/Network/uip/webserver/http-strings.c

@@ -58,6 +58,9 @@ const char http_404_html[10] =
 const char http_referer[9] = 
 /* "Referer:" */
 {0x52, 0x65, 0x66, 0x65, 0x72, 0x65, 0x72, 0x3a, };
+const char http_header_preflight[251] = 
+/* "HTTP/1.0 200 OK\r\nServer: uIP/1.0\r\nConnection: Keep-Alive\r\nAccess-Control-Allow-Origin: *\r\nAccess-Control-Allow-Methods: POST, GET, OPTIONS\r\nAccess-Control-Allow-Headers: X-Filename, Content-Type, Pragma, Cache-Control\r\nAccess-Control-Max-Age: 86400\r\n" */
+{0x48, 0x54, 0x54, 0x50, 0x2f, 0x31, 0x2e, 0x30, 0x20, 0x32, 0x30, 0x30, 0x20, 0x4f, 0x4b, 0xd, 0xa, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x3a, 0x20, 0x75, 0x49, 0x50, 0x2f, 0x31, 0x2e, 0x30, 0xd, 0xa, 0x43, 0x6f, 0x6e, 0x6e, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x3a, 0x20, 0x4b, 0x65, 0x65, 0x70, 0x2d, 0x41, 0x6c, 0x69, 0x76, 0x65, 0xd, 0xa, 0x41, 0x63, 0x63, 0x65, 0x73, 0x73, 0x2d, 0x43, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x2d, 0x41, 0x6c, 0x6c, 0x6f, 0x77, 0x2d, 0x4f, 0x72, 0x69, 0x67, 0x69, 0x6e, 0x3a, 0x20, 0x2a, 0xd, 0xa, 0x41, 0x63, 0x63, 0x65, 0x73, 0x73, 0x2d, 0x43, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x2d, 0x41, 0x6c, 0x6c, 0x6f, 0x77, 0x2d, 0x4d, 0x65, 0x74, 0x68, 0x6f, 0x64, 0x73, 0x3a, 0x20, 0x50, 0x4f, 0x53, 0x54, 0x2c, 0x20, 0x47, 0x45, 0x54, 0x2c, 0x20, 0x4f, 0x50, 0x54, 0x49, 0x4f, 0x4e, 0x53, 0xd, 0xa, 0x41, 0x63, 0x63, 0x65, 0x73, 0x73, 0x2d, 0x43, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x2d, 0x41, 0x6c, 0x6c, 0x6f, 0x77, 0x2d, 0x48, 0x65, 0x61, 0x64, 0x65, 0x72, 0x73, 0x3a, 0x20, 0x58, 0x2d, 0x46, 0x69, 0x6c, 0x65, 0x6e, 0x61, 0x6d, 0x65, 0x2c, 0x20, 0x43, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74, 0x2d, 0x54, 0x79, 0x70, 0x65, 0x2c, 0x20, 0x50, 0x72, 0x61, 0x67, 0x6d, 0x61, 0x2c, 0x20, 0x43, 0x61, 0x63, 0x68, 0x65, 0x2d, 0x43, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0xd, 0xa, 0x41, 0x63, 0x63, 0x65, 0x73, 0x73, 0x2d, 0x43, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x2d, 0x4d, 0x61, 0x78, 0x2d, 0x41, 0x67, 0x65, 0x3a, 0x20, 0x38, 0x36, 0x34, 0x30, 0x30, 0xd, 0xa, };
 const char http_header_200[86] = 
 /* "HTTP/1.0 200 OK\r\nServer: uIP/1.0\r\nAccess-Control-Allow-Origin: *\r\nConnection: close\r\n" */
 {0x48, 0x54, 0x54, 0x50, 0x2f, 0x31, 0x2e, 0x30, 0x20, 0x32, 0x30, 0x30, 0x20, 0x4f, 0x4b, 0xd, 0xa, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x3a, 0x20, 0x75, 0x49, 0x50, 0x2f, 0x31, 0x2e, 0x30, 0xd, 0xa, 0x41, 0x63, 0x63, 0x65, 0x73, 0x73, 0x2d, 0x43, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x2d, 0x41, 0x6c, 0x6c, 0x6f, 0x77, 0x2d, 0x4f, 0x72, 0x69, 0x67, 0x69, 0x6e, 0x3a, 0x20, 0x2a, 0xd, 0xa, 0x43, 0x6f, 0x6e, 0x6e, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x3a, 0x20, 0x63, 0x6c, 0x6f, 0x73, 0x65, 0xd, 0xa, };

src/libs/Network/uip/webserver/http-strings.h

@@ -18,6 +18,7 @@ extern const char http_crnl[3];
 extern const char http_index_html[12];
 extern const char http_404_html[10];
 extern const char http_referer[9];
+extern const char http_header_preflight[251];
 extern const char http_header_200[86];
 extern const char http_header_304[184];
 extern const char http_header_404[93];