httpd: fixed using pools, fixed missing default value of LWIP_HTTPD_SSI_RAW, fixed typo

src/include/lwip/apps/httpd.h

@@ -165,7 +165,7 @@ typedef u16_t (*tSSIHandler)(
 void http_set_ssi_handler(tSSIHandler pfnSSIHandler,
                           const char **ppcTags, int iNumTags);
 
-/** For LWIP_HTTPD_SSI_RAW==1, return this to indicat the tag is unknown.
+/** For LWIP_HTTPD_SSI_RAW==1, return this to indicate the tag is unknown.
  * In this case, the webserver writes a warning into the page.
  * You can also just return 0 to write nothing for unknown tags.
  */

src/include/lwip/apps/httpd_opts.h

@@ -58,6 +58,12 @@
 #define LWIP_HTTPD_SSI            0
 #endif
 
+/** Set this to 1 to implement an SSI tag handler callback that gets a const char*
+ * to the tag (instead of an index into a pre-registered array of known tags) */
+#ifndef LWIP_HTTPD_SSI_RAW
+#define LWIP_HTTPD_SSI_RAW        0
+#endif
+
 /** Set this to 1 to support HTTP POST */
 #ifndef LWIP_HTTPD_SUPPORT_POST
 #define LWIP_HTTPD_SUPPORT_POST   0