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RL-ARM User's Guide (MDK v4)

RL-RTX RL-FlashFS RL-TCPnet TCP Socket Opening TCP Connection TCP Active Open TCP Passive Open Sending TCP Data Example for Sending Data Multiple TCP Connections UDP Socket Opening UDP Connection Sending UDP Data When DHCP Enabled When ARP Cache Empty Example for Sending Data IP Multicasting Multiple UDP Connections Configuring RL-TCPnet Static Configuration System Definitions Ethernet Network Interface PPP Network Interface SLIP Network Interface UDP Socket TCP Socket BSD Socket HTTP Server Telnet Server TFTP Server TFTP Client FTP Server FTP Client DNS Client SMTP Client SNMP Agent SNTP Client Error Function Runtime Configuration Library Files Using RL-TCPnet Stand Alone With RTX Kernel Event Driven Operation IP Address Assignment Ethernet Interface PPP Interface SLIP Interface Localhost Applications HTTP Server Script Language CGI Functions Ajax Support Using XML XML Example How it works SOAP Support SOAP Interface Large POST Messages Web Pages Default Page Error Pages Web on SD Card Web Update File System Interface Http Caching How it works Internal Web External Web Multi-user Authentication Using RAM File System FCARM File Converter PRINT Directive NOPRINT Directive PAGEWIDTH Directive PAGELENGTH Directive ROOT Directive Telnet Server Command Line Interface Multi-user Authentication Sending Reply Message Short Reply Long Reply Continuous Screen Update TFTP Server File System Interface TFTP Client File System Interface FTP Server File System Interface Multi-user Authentication Supported Commands FTP Client File System Interface SMTP Client SNMP Agent MIB Database MIB Interface MIB Entry MIB Table DNS Resolver Starting DNS Device Drivers Ethernet Driver Interrupt Mode Modem Driver Serial Driver Using Serial Link Cable Connection Modem Connection Windows Dial-up Add Direct Serial Link New Dial-up Connection Configure PPP Dial-up Configure SLIP Dial-up Debugging Enabling Debug Debug Level Redirecting Output Function Overview BSD Routines CGI Routines Ethernet Routines FTP Routines HTTP Routines IGMP Routines Miscellaneous Routines Modem Routines PPP Routines Serial Routines SLIP Routines SMTP Routines SNMP Routines System Functions TCP Routines Telnet Routines TFTP Routines UDP Routines RL-CAN RL-USB Example Programs Library Reference Appendix

HTTP Server

RL-TCPnet has integrated a tiny Hypertext Transfer Protocol Server (HTTP) that can be used to transfer integrated web pages to a remote client.

The following HTTP Server options are configurable:

  • HTTP Server switch enables or disables the HTTP Server service in your application. It is enabled when this value is set to 1. It should be set to 0 when HTTP server is not used in your application.
    #define HTTP_ENABLE    1
  • Number of HTTP Sessions specifies the number of available HTTP sessions. You must increase this number if the web page has many objects (like gif or jpeg images). The remote HTTP client, sometimes called the web browser, opens multiple connections when downloading such pages.
    #define HTTP_NUMSESS   3
  • Port Number specifies the listening TCP port number. The default HTTP server listening port is 80.
    #define HTTP_PORTNUM   80
  • Server-Id header specifies the custom HTTP Server header identification. This identification is contained in each Web server response packet. When this option contains an empty string, a default Server-Id from the library is used instead. The default definition is an empty string.
    #define HTTP_SRVID     ""
  • Enable User Authentication switch enables or disables the WEB Server authentication with a username and a password. The user authentication is enabled, when this value is set to 1.
    #define HTTP_ENAUTH    1
  • Authentication Realm is the string which displays in the internet browser's authentication dialog when authentication is required. This is a zero terminated string.
    #define HTTP_AUTHREALM "Embedded WEB Server"
  • Authentication Username is the username identification.
    #define HTTP_AUTHUSER  "admin"
  • Authentication Password is the default password, that must be stored in Non volatile memory. The user can change the password later.
    #define HTTP_AUTHPASSW ""


  • When the HTTP server is not enabled, the ARM linker does not link the HTTP support modules to your application and thus reduces the code size and memory usage.
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