Fix bug: error in recv : 104

The issue with the error in recv : 104 has been resolved.
The root cause of the problem was due to Due to sockets being fully utilized, leading to httpd_txrxand httpd_sock_errissues.
This has been partially fixed to ensure that the application runs smoothly without any errors.
solution :
    1. Component config > LWIP > Max number of open sockets > 16
    2. Removed httpd_resp_set_hdr(req, "Connection", "keep-alive"); from auth_handler.c

Author: gjroots

components/web_server/auth_handler.c

@@ -80,6 +80,7 @@ esp_err_t authentication_handler(httpd_req_t *req, int req_id)
   if (block_request())
   {
     httpd_resp_set_status(req, HTTPD_403);
+    httpd_resp_set_hdr(req, "Connection", "close");
     httpd_resp_send(req, NULL, 0);
     return ESP_OK;
   }
@@ -95,7 +96,7 @@ esp_err_t authentication_handler(httpd_req_t *req, int req_id)
       {
         failed_attempts_count = 0;
         httpd_resp_set_status(req, HTTPD_200);
-        httpd_resp_set_hdr(req, "Connection", "keep-alive");
+        // httpd_resp_set_hdr(req, "Connection", "keep-alive");
         // Forward request to respective fields
         switch (req_id)
         {
@@ -120,7 +121,7 @@ esp_err_t authentication_handler(httpd_req_t *req, int req_id)
   }
 
   httpd_resp_set_status(req, HTTPD_401);
-  httpd_resp_set_hdr(req, "Connection", "keep-alive");
+  // httpd_resp_set_hdr(req, "Connection", "keep-alive");
   httpd_resp_set_hdr(req, "WWW-Authenticate", "Basic realm=\"Hello authenticate first\"");
   httpd_resp_send(req, NULL, 0);
 

sdkconfig.esp32dev

@@ -736,7 +736,7 @@ CONFIG_LWIP_DNS_SUPPORT_MDNS_QUERIES=y
 CONFIG_LWIP_L2_TO_L3_COPY=y
 # CONFIG_LWIP_IRAM_OPTIMIZATION is not set
 CONFIG_LWIP_TIMERS_ONDEMAND=y
-CONFIG_LWIP_MAX_SOCKETS=10
+CONFIG_LWIP_MAX_SOCKETS=16
 # CONFIG_LWIP_USE_ONLY_LWIP_SELECT is not set
 # CONFIG_LWIP_SO_LINGER is not set
 CONFIG_LWIP_SO_REUSE=y

sdkconfig.esp32dev.old

@@ -170,26 +170,13 @@ CONFIG_APPTRACE_DEST_NONE=y
 CONFIG_APPTRACE_LOCK_ENABLE=y
 # end of Application Level Tracing
 
-#
-# ESP-ASIO
-#
-# CONFIG_ASIO_SSL_SUPPORT is not set
-# end of ESP-ASIO
-
 #
 # Bluetooth
 #
 # CONFIG_BT_ENABLED is not set
 # end of Bluetooth
 
-#
-# CoAP Configuration
-#
-CONFIG_COAP_MBEDTLS_PSK=y
-# CONFIG_COAP_MBEDTLS_PKI is not set
-# CONFIG_COAP_MBEDTLS_DEBUG is not set
 CONFIG_COAP_LOG_DEFAULT_LEVEL=0
-# end of CoAP Configuration
 
 #
 # Driver configurations
@@ -757,17 +744,15 @@ CONFIG_LWIP_SO_REUSE_RXTOALL=y
 # CONFIG_LWIP_SO_RCVBUF is not set
 # CONFIG_LWIP_NETBUF_RECVINFO is not set
 CONFIG_LWIP_IP4_FRAG=y
-CONFIG_LWIP_IP6_FRAG=y
 # CONFIG_LWIP_IP4_REASSEMBLY is not set
-# CONFIG_LWIP_IP6_REASSEMBLY is not set
 CONFIG_LWIP_IP_FORWARD=y
 CONFIG_LWIP_IPV4_NAPT=y
 # CONFIG_LWIP_STATS is not set
 # CONFIG_LWIP_ETHARP_TRUST_IP_MAC is not set
 CONFIG_LWIP_ESP_GRATUITOUS_ARP=y
 CONFIG_LWIP_GARP_TMR_INTERVAL=60
 CONFIG_LWIP_TCPIP_RECVMBOX_SIZE=32
-# CONFIG_LWIP_DHCP_DOES_ARP_CHECK is not set
+CONFIG_LWIP_DHCP_DOES_ARP_CHECK=y
 # CONFIG_LWIP_DHCP_DISABLE_CLIENT_ID is not set
 CONFIG_LWIP_DHCP_DISABLE_VENDOR_CLASS_ID=y
 # CONFIG_LWIP_DHCP_RESTORE_LAST_IP is not set
@@ -782,12 +767,7 @@ CONFIG_LWIP_DHCPS_MAX_STATION_NUM=8
 # end of DHCP server
 
 # CONFIG_LWIP_AUTOIP is not set
-CONFIG_LWIP_IPV6=y
-CONFIG_LWIP_IPV6_AUTOCONFIG=y
-CONFIG_LWIP_IPV6_NUM_ADDRESSES=3
-CONFIG_LWIP_IPV6_FORWARD=y
-CONFIG_LWIP_IPV6_RDNSS_MAX_DNS_SERVERS=0
-CONFIG_LWIP_IPV6_DHCP6=y
+# CONFIG_LWIP_IPV6 is not set
 # CONFIG_LWIP_NETIF_STATUS_CALLBACK is not set
 CONFIG_LWIP_NETIF_LOOPBACK=y
 CONFIG_LWIP_LOOPBACK_MAX_PBUFS=8
@@ -836,8 +816,6 @@ CONFIG_LWIP_TCPIP_TASK_AFFINITY_NO_AFFINITY=y
 # CONFIG_LWIP_TCPIP_TASK_AFFINITY_CPU1 is not set
 CONFIG_LWIP_TCPIP_TASK_AFFINITY=0x7FFFFFFF
 # CONFIG_LWIP_PPP_SUPPORT is not set
-CONFIG_LWIP_IPV6_MEMP_NUM_ND6_QUEUE=3
-CONFIG_LWIP_IPV6_ND6_NUM_NEIGHBORS=5
 # CONFIG_LWIP_SLIP_SUPPORT is not set
 
 #
@@ -870,12 +848,6 @@ CONFIG_LWIP_ESP_LWIP_ASSERT=y
 # CONFIG_LWIP_HOOK_TCP_ISN_NONE is not set
 CONFIG_LWIP_HOOK_TCP_ISN_DEFAULT=y
 # CONFIG_LWIP_HOOK_TCP_ISN_CUSTOM is not set
-CONFIG_LWIP_HOOK_IP6_ROUTE_NONE=y
-# CONFIG_LWIP_HOOK_IP6_ROUTE_DEFAULT is not set
-# CONFIG_LWIP_HOOK_IP6_ROUTE_CUSTOM is not set
-CONFIG_LWIP_HOOK_ND6_GET_GW_NONE=y
-# CONFIG_LWIP_HOOK_ND6_GET_GW_DEFAULT is not set
-# CONFIG_LWIP_HOOK_ND6_GET_GW_CUSTOM is not set
 CONFIG_LWIP_HOOK_NETCONN_EXT_RESOLVE_NONE=y
 # CONFIG_LWIP_HOOK_NETCONN_EXT_RESOLVE_DEFAULT is not set
 # CONFIG_LWIP_HOOK_NETCONN_EXT_RESOLVE_CUSTOM is not set