Minimal web server using netcat

Question

I m trying to set up a minimal web server using netcat  nc   When the browser calls up localhost 1500  for instance  it should show the result of a function  date in the example below  but eventually it ll be a python or c program that yields some data   My little netcat web server needs to be a while true loop in bash  possibly as simple as this   while true   do  echo -e  HTTP 1 1 200 OK n n   date     nc -l -p 1500    done   When I try this the browser shows the currently available data during the moment when nc starts  I want the browser displays the data during the moment the browser requests it  though  How can I achieve this

User · Answer

LOL  a super lame hack  but at least curl and firefox accepts it   while true   do  dd if  dev zero count 10000 echo -e  HTTP 1 1 n n   date      nc -l  1500    done   You better replace it soon with something proper   Ah yes  my nc were not exactly the same as yours  it did not like the -p option

User · Answer

Try this   while true   do nc -l -p 1500 -c  echo -e  HTTP 1 1 200 OK n n   date     done   The -cmakes netcat execute the given command in a shell  so you can use echo  If you don t need echo  use -e  For further information on this  try man nc  Note  that when using echo there is no way for your program  the date-replacement  to get the browser request  So you probably finally want to do something like this   while true   do nc -l -p 1500 -e  path to yourprogram   done   Where yourprogram must do the protocol stuff like handling GET  sending HTTP 200 etc

User · Answer

I had the same need problem but nothing here worked for me  or I didn t understand everything   so this is my solution   I post my minimal http server sh  working with my  bin bash  4 3 11  but not  bin sh because of the redirection    rm -f out mkfifo out trap  rm -f out  EXIT while true do   cat out   nc -l 1500  gt   gt     parse the netcat output  to build the answer redirected to the pipe  out       export REQUEST      while read -r line     do       line   echo   line    tr -d   r n          if echo   line    grep -qE   GET      if line starts with  GET          then         REQUEST   echo   line    cut -d     -f2    extract the request       elif   -z   line      empty line   end of request       then           call a script here           Note  REQUEST is exported  so the script can parse it  to answer 200 403 404 status code   content            a script sh  gt  out       fi     done     done   And my a script sh  with your need       bin bash  echo -e  HTTP 1 1 200 OK r  echo  Content-type  text html  echo  date

User · Answer

Actually  the best way to close gracefully the connection is to send the Content-Length header like following  Client  like curl will close the connection after receiving the data   DATA  Date    date     LENGTH   echo  DATA   wc -c   echo -e  HTTP 1 1 200 OK nContent-Length    LENGTH  n n  DATA     nc -l -p 8000

User · Answer

The problem you are facing is that nc does not know when the web client is done with its request so it can respond to the request  A web session should go something like this    TCP session is established  Browser Request Header  GET   HTTP 1 1 Browser Request Header  Host  www google com Browser Request Header   n  Note  Browser is telling Webserver that the request header is complete  Server Response Header  HTTP 1 1 200 OK Server Response Header  Content-Type  text html Server Response Header  Content-Length  24 Server Response Header   n  Note  Webserver is telling browser that response header is complete  Server Message Body   lt html gt sample html lt  html gt  Server Message Body   n  Note  Webserver is telling the browser that the requested resource is finished   The server closes the TCP session    Lines that begin with   n  are simply empty lines without even a space and contain nothing more than a new line character    I have my bash httpd launched by xinetd  xinetd tutorial  It also  logs date  time  browser IP address  and the entire browser request to a log file  and calculates Content-Length for the Server header response   user machine  usr local bin  cat   bash httpd    bin bash x 0  Log    echo -n      date    F  T  Z      REMOTE HOST              while read I  x   amp  amp       I  x   -gt 1   do               echo -n      I  x     sed -e s         let  x    x   1           done      echo  Log  gt  gt   var log bash httpd  Message Body   echo -en   lt html gt Sample html lt  html gt    echo -en  HTTP 1 0 200 OK nContent-Type  text html nContent-Length     Message Body  n n Message Body    To add more functionality  you could incorporate               METHOD   echo   I 0    cut -d    -f1              REQUEST   echo   I 0    cut -d    -f2              HTTP VERSION   echo   I 0    cut -d    -f3              If METHOD    GET     then                  case   REQUEST  in                           Message Body  HTML formatted home page stuff                                                  who  Message Body  HTML formatted results of who                                                  ps  Message Body  HTML formatted results of ps                                                    Message Body   Error Page not found header and content                                            esac              fi   Happy bashing

User · Answer

I think the problem that all the solution listed doesn t work  is intrinsic in the nature of http service  the every request established is with a different client and the response need to be processed in a different context  every request must fork a new instance of response     The current solution I think is the -e of netcat but I don t know why doesn t work    maybe is my nc version that I test on openwrt     with socat it works      I try this https   github com avleen bashttpd  and it works  but I must run the shell script with this command   socat tcp-l 80 reuseaddr fork EXEC bashttpd  amp    The socat and netcat samples on github doesn t works for me  but the socat that I used works

User · Answer

Another way to do this  while true  do  echo -e  HTTP 1 1 200 OK r n   echo -e   n tMy website has date function    echo -e   t  date  n     nc -lp 8080  done   Let s test it with 2 HTTP request using curl  In this example  172 16 2 6 is the server IP Address   Server Side  admin server    while true  do  echo -e  HTTP 1 1 200 OK r n   echo -e   n tMy website has date function    echo -e   t  date  n     nc -lp 8080  done  GET   HTTP 1 1 Host  172 16 2 6 8080 User-Agent  curl 7 48 0 Accept       GET   HTTP 1 1 Host  172 16 2 6 8080 User-Agent  curl 7 48 0 Accept        Client Side  user client    curl 172 16 2 6 8080          My website has date function         Tue Jun 13 18 00 19 UTC 2017  user client    curl 172 16 2 6 8080          My website has date function         Tue Jun 13 18 00 24 UTC 2017  user client      If you want to execute another command  feel free to replace   date

User · Answer

If you re using Apline Linux  the BusyBox netcat is slightly different  while true  do nc -l -p 8080 -e sh -c  echo -e  quot HTTP 1 1 200 OK n n  date  quot    done  And another way using printf  while true  do nc -l -p 8080 -e sh -c  quot printf  HTTP 1 1 200 OK n n s    quot   date   quot  quot   done

User · Answer

Type in nc -h and see if You have -e option available  If yes  You can create a script  for example   script sh  echo -e  HTTP 1 1 200 OK n n   date     and run it like this   while true   do nc -l -p 1500 -e script sh  done   Note that -e option needs to be enabled at compilation to be available

User · Answer

Here is a beauty of a little bash webserver  I found it online and forked a copy and spruced it up a bit - it uses socat or netcat I have tested it with socat -- it is self-contained in one-script and generates its own configuration file and favicon    By default it will start up as a web enabled file browser yet is easily configured by the configuration file for any logic  For files it streams images and music  mp3 s   video  mp4 s  avi  etc  -- I have tested streaming various file types to Linux Windows and Android devices including a smartwatch    I think it streams better than VLC actually  I have found it useful for transferring files to remote clients who have no access beyond a web browser e g  Android smartwatch without needing to worry about physically connecting to a USB port    If you want to try it out just copy and paste it to a file named bashttpd  then start it up on the host with   gt  bashttpd -s  Then you can go to any other computer  presuming the firewall is not blocking inbound tcp connections to port 8080 -- the default port  you can change the port to whatever you want using the global variables at the top of the script   http   bashttpd server ip 8080                  usr bin env bash                                                                                                                                                                                         bashttpd v 1 12         Original author  Avleen Vig        2012     Reworked by      Josh Cartwright   2012     Modified by      A M Danischewski  2015      Issues  If you find any issues leave me a comment at      http   scriptsandoneliners blogspot com 2015 04 bashttpd-self-contained-bash-webserver html           This is a simple Bash based webserver  By default it will browse files and allows for      retrieving binary files            It has been tested successfully to view and stream files including images  mp3s       mp4s and downloading files of any type including binary and compressed files via       any web browser            Successfully tested on various browsers on Windows  Linux and Android devices  including the      Android Smartwatch ZGPAX S8              It handles favicon requests by hardcoded favicon image -- by default a marathon      runner  change it to whatever you want  By base64 encoding your favorit favicon      and changing the global variable below this header             Make sure if you have a firewall it allows connections to the port you plan to      listen on  8080 by default              By default this program will allow for the browsing of files from the      computer where it is run              Make sure you are allowed connections to the port you plan to listen on       8080 by default   Then just drop it on a host machine  that has bash       and start it up like this                 192 168 1 101 gt  bashttpd -s               On the remote machine you should be able to browse and download files from the host      server via any web browser by visiting                http   192 168 1 101 8080             This program requires  to work to full capacity  by default       socat or netcat  w   -e  option - on Ubuntu netcat-traditional      tree - useful for pretty directory listings      If you are using socat  you can type  bashttpd -s            to start listening on the LISTEN PORT  default is 8080   you can change      the port below         E g     nc -lp 8080 -e   bashttpd     lt -- If your nc has the -e option          E g     nc traditional -lp 8080 -e   bashttpd       E g     bashttpd -s  -or- socat TCP4-LISTEN 8080 fork EXEC bashttpd          Copyright  C  2012  Avleen Vig  lt avleen gmail com gt           Permission is hereby granted  free of charge  to any person obtaining a copy of     this software and associated documentation files  the  Software    to deal in     the Software without restriction  including without limitation the rights to     use  copy  modify  merge  publish  distribute  sublicense  and or sell copies of     the Software  and to permit persons to whom the Software is furnished to do so      subject to the following conditions           The above copyright notice and this permission notice shall be included in all     copies or substantial portions of the Software           THE SOFTWARE IS PROVIDED  AS IS   WITHOUT WARRANTY OF ANY KIND  EXPRESS OR     IMPLIED  INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY  FITNESS     FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT  IN NO EVENT SHALL THE AUTHORS OR     COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM  DAMAGES OR OTHER LIABILITY  WHETHER     IN AN ACTION OF CONTRACT  TORT OR OTHERWISE  ARISING FROM  OUT OF OR IN     CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE                                                                                                                                                                        CHANGE THIS TO WHERE YOU WANT THE CONFIGURATION FILE TO RESIDE  declare -r BASHTTPD CONF   tmp bashttpd conf         CHANGE THIS IF YOU WOULD LIKE TO LISTEN ON A DIFFERENT PORT  declare -i LISTEN PORT 8080        If you are on AIX  IRIX  Solaris  or a hardened system redirecting      to  dev random will probably break  you can change it to  dev null    declare -a DUMP DEV   dev random        Just base64 encode your favorite favicon and change this to whatever you want      declare -r FAVICON  AAABAAEAEBAAAAEAIABoBAAAFgAAACgAAAAQAAAAIAAAAAEAIAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAADg4 3 srjc 5KV2P ortn xMrj 6Ch1P Vl9f jIzc 3572f CgNr fnzP 3l01f Ih9r h4TZ 8fN4  P1Oj 3uPr 7O 1v xu9X u8XY 9bi6v UmdD XV26 3F1x  GitT VVXC 3x x  HjNT lp3Z 6633f E0eD 2ePr  bt8v U4 v 0uLp 9Xj6  Z5e3 oKbX 0pJt 9maML cHLF 3p8x  T3 n 3Ofu 9vo7  W5Oz 0uHq 9zn7f j6vD 1OLs 8 f6P R4Oj 1OPr 7jA4f9KSbf Skm3 3p yf U4ez 1ePq 9rn7  Z5e3 0uHp 87e5  a5Ov 5Ovw 9Hf6v T4uv 1OLp 9bj6  kq9r Skq3 0pJt  cotb zdnp 9jl7f a5u  1 Ts 9Pi6v O3ub 2uXr  bt8P Q3un 0eDq 9bj7P Z5u7 r7jd 0tKt 9NTLf S0u2 8zW6v c5   2 fv 9bj6  S4un zt3m 9zm7P k7PD 1OPr 9Li7P V5Oz 2OXt 9jl7v HjM3 lZvT 0tKt  6w L 2ebu 9fk7P V4 v 0uHq 83d5v a5ev 5ezw 9Pi6v U4 z 1eXs 9bj6  b5   vsjj 1hYvP9JSLb horM 9nk7P X5e3 1eTs 9Pi6v P3uf 2eXr  Tr7  O3 n 0uLr 9Xk7P Y5e3 w8 k 7XA3 9JR7f SEe3 2lrw  G0OX 1uLr 9Xi7P T4ev 0N o 9zn7f k7PD zN3p 8rd5v T4ur 1ePt 5We0  0w9  SEe3 0pKt 9OTrf p7HZ 7fD3  T4uv 0N o 9Hg6f d5 3 5ezw 9Li6  T4uv 2ubu 8PQ5f9 hsr ucff 4eOzv Ei8z rLja 8zc6P I1 b 0OLq 8 f6P Q4Oj 3eft  bs8f R4On 0 Lq 9Tj6v T4Ov wM7h 9Df6f M2uf z97q 9Dg6f Q4On 1OPr 9Tj6  S4ur 0ODp 93o7f n7vH 0N o 8 f5  P3 b 2OXt 9zo8P c6fH zdjn 7fB3  3weD 1eLs 9nn7  V5Oz 0 Lr 9Pi6  e6O7 5u3x 9Pi6v S4en 0uLp 9Tj6  W4 v 3Ojw 9rm7v9vccT wcvm 9rn7  X5Oz 0uHq 9Hg6f S4er 3uju  bt8f R4On 0uHp 9Xk6  Y5u7 1OTs 9bk7P W5Ov XFy9 2lrwf a5   1uPr 9Pi6v U4er 0eHq 93o7v v8vT 5ezw  bt8f o7vL 6e z  jv8v p7 L 6e y 9XZ6  IzOX 6e7y  nv8v o7vL 5 7x  ft8f r8PP AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA      declare -i DEBUG 1  declare -i VERBOSE 0 declare -a REQUEST HEADERS declare    REQUEST URI     declare -a HTTP RESPONSE       200   OK      400   Bad Request      403   Forbidden      404   Not Found      405   Method Not Allowed      500   Internal Server Error   declare DATE   date    a   d  b  Y  H  M  S  Z   declare -a RESPONSE HEADERS          Date   DATE      Expires   DATE       Server  Slash Bin Slash Bash     function warn         VERBOSE     amp  amp  echo  WARNING       gt  amp 2     function chk conf file        -r    BASHTTPD CONF             cat  gt    BASHTTPD CONF    lt  lt  EOF      bashttpd conf - configuration for bashttpd     The behavior of bashttpd is dictated by the evaluation   of rules specified in this configuration file   Each rule   is evaluated until one is matched   If no rule is matched    bashttpd will serve a 500 Internal Server Error      The format of the rules are       on uri match REGEX command  args       unconditionally command  args      on uri match      On an incoming request  the URI is checked against the specified      bash-supported extended  regular expression  and if encounters a match the     specified command is executed with the specified arguments        For additional flexibility  on uri match will also pass the results of the     regular expression match    BASH REMATCH     as additional arguments to the     command      unconditionally      Always serve via the specified command   Useful for catchall rules      The following commands are available for use        serve file FILE       Statically serves a single file        serve dir with tree DIRECTORY       Statically serves the specified directory using  tree    It must be       installed and in the PATH        serve dir with ls DIRECTORY       Statically serves the specified directory using  ls -al         serve dir  DIRECTORY       Statically serves a single directory listing   Will use  tree  if it is       installed and in the PATH  otherwise   ls -al        serve dir or file from DIRECTORY       Serves either a directory listing  using serve dir  or a file  using       serve file    Constructs local path by appending the specified root       directory  and the URI portion of the client request        serve static string STRING       Serves the specified static string with Content-Type text plain      Examples of rules      on uri match    issue   serve file   etc issue        When a client s requested URI matches the string   issue   serve them the     contents of  etc issue     on uri match  root  serve dir         When a client s requested URI has the word  root  in it  serve up     a directory listing of       DOCROOT  var www html   on uri match         serve dir or file from   DOCROOT      When any URI request is made  attempt to serve a directory listing     or file content based on the request URI  by mapping URI s to local     paths relative to the specified   DOCROOT     unconditionally serve static string  Hello  world   You can configure bashttpd by modifying bashttpd conf   DOCROOT   on uri match         serve dir or file from    More about commands      It is possible to somewhat easily write your own commands   An example   may help   The following example will serve  Hello   x   whenever   a client sends a request with the URI  say hello to  x      serve hello          add response header  Content-Type   text plain       send response ok exit  lt  lt  lt   Hello   2         on uri match    say hello to        serve hello     Like mentioned before  the contents of   BASH REMATCH     are passed   to your command  so its possible to use regular expression groups   to pull out info      With this example  when the requested URI is  say hello to Josh  serve hello   is invoked with the arguments   say hello to Josh   Josh        BASH REMATCH 0   is always the full match  EOF    warn  Created bashttpd conf using defaults   Please review and configure bashttpd conf before running bashttpd again      exit 1       function recv         VERBOSE     amp  amp  echo   lt       gt  amp 2     function send         VERBOSE     amp  amp  echo   gt       gt  amp 2  echo          function add response header     RESPONSE HEADERS     1   2       function send response binary       local code   1    local file    2      local transfer stats       local tmp stat file   tmp  send response        send  HTTP 1 0  1   HTTP RESPONSE  1      for i in    RESPONSE HEADERS       do      send   i    done   send  if     VERBOSE     then        Use dd since it handles null bytes   dd 2 gt    tmp stat file    lt     file      transfer stats    lt    tmp stat file       echo -en   gt  gt  Transferred    file  n gt  gt    awk   copied  print    lt  lt  lt     transfer stats    n   gt  amp 2     rm    tmp stat file    else        Use dd since it handles null bytes   dd 2 gt    DUMP DEV    lt     file       fi        function send response       local code   1    send  HTTP 1 0  1   HTTP RESPONSE  1      for i in    RESPONSE HEADERS       do      send   i    done   send   while IFS  read -r line  do      send    line     done    function send response ok exit     send response 200  exit 0     function send response ok exit binary     send response binary 200     1    exit 0     function fail with     send response   1   lt  lt  lt    1   HTTP RESPONSE  1     exit 1     function serve file       local file   1    local CONTENT TYPE      case    file   in        css        CONTENT TYPE  text css                  js        CONTENT TYPE  text javascript                        CONTENT TYPE   file -b --mime-type    file               esac   add response header  Content-Type      CONTENT TYPE     CONTENT LENGTH   stat -c  s     file       add response header  Content-Length     CONTENT LENGTH          Use binary safe transfer method since text doesn t break     send response ok exit binary    file      function serve dir with tree       local dir   1  tree vers tree opts basehref x        HTML 5 compatible way to avoid tree html from generating favicon        requests in certain browsers  such as browsers in android smartwatches        local no favicon    lt link href   data image x-icon base64   FAVICON    rel   icon   type   image x-icon     gt       local tree page       local base server path     2           base server path           amp  amp  base server path         local tree opts  --du -h -a --dirsfirst     add response header  Content-Type   text html       The --du option was added in 1 6 0        2        read   tree vers x  lt   lt  tree --version    tree page   tree -H   base server path  -L 1    tree opts   -D    dir      tree page   sed  5 i   no favicon    lt  lt  lt     tree page              tree vers      v1 6        send response ok exit  lt  lt  lt     tree page        function serve dir with ls       local dir   1    add response header  Content-Type   text plain    send response ok exit  lt          lt  ls -la    dir       function serve dir       local dir   1       If  tree  is installed  use that for pretty output    which tree  amp  gt    DUMP DEV    amp  amp         serve dir with tree        serve dir with ls        fail with 500    function urldecode          1             amp  amp  echo         echo -e    sed  s       xdigit     2        x 1 g   lt  lt  lt     1            function serve dir or file from       local URL PATH    1    3     shift   URL PATH   urldecode    URL PATH           URL PATH             amp  amp  fail with 400      Serve index file if exists in requested directory      -d    URL PATH    amp  amp  -f    URL PATH  index html   amp  amp  -r    URL PATH  index html      amp  amp         URL PATH    URL PATH  index html    if    -f    URL PATH       then         -r    URL PATH       amp  amp            serve file    URL PATH           fail with 403   elif    -d    URL PATH       then         -x    URL PATH       amp  amp            serve dir     URL PATH           fail with 403   fi   fail with 404    function serve static string       add response header  Content-Type   text plain    send response ok exit  lt  lt  lt    1     function on uri match       local regex   1    shift         REQUEST URI       regex     amp  amp                 BASH REMATCH         function unconditionally            REQUEST URI      function main        local recv       local line       local REQUEST METHOD      local REQUEST HTTP VERSION       chk conf file        UID    0     amp  amp  warn  It is not recommended to run bashttpd as root        Request-Line HTTP RFC 2616  5 1   read -r line    fail with 400   line   line     r     recv    line     read -r REQUEST METHOD REQUEST URI REQUEST HTTP VERSION  lt  lt  lt     line       -n    REQUEST METHOD      amp  amp    -n    REQUEST URI      amp  amp         -n    REQUEST HTTP VERSION        fail with 400      Only GET is supported at this time        REQUEST METHOD      GET       fail with 405   while IFS  read -r line  do     line   line     r       recv    line           If we ve reached the end of the headers  break        -z    line      amp  amp  break     REQUEST HEADERS      line      done     if      -z    1       amp  amp       1      -s     then   socat TCP4-LISTEN   LISTEN PORT  fork EXEC    0    else   main   source    BASHTTPD CONF     fail with 500 fi

User · Answer

Donno how or why but i manage to find this around and it works for me  i had the problem I wanted to return the result of executing a bash    while true  do   echo -e  HTTP 1 1 200 OK r n   sh test      nc -l 8080  done   NOTE  This command was taken from  http   www razvantudorica com 08 web-server-in-one-line-of-bash  this executes bash script test and return the result to a browser client connecting to the server running this command on port 8080  My script does this ATM    nano test     bin bash  echo              PRINT SOME TEXT                n  echo  Hello World     echo   n   echo  Resources   vmstat -S M echo   n   echo  Addresses   echo    ifconfig   echo   n    echo    gpio readall     and my web browser is showing              PRINT SOME TEXT                 Hello World      Resources  procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----  r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa  0  0      0    314     18     78    0    0     2     1  306   31  0  0 100  0   Addresses  eth0      Link encap Ethernet  HWaddr b8 27 eb 86 e8 c5             inet addr 192 168 1 83  Bcast 192 168 1 255  Mask 255 255 255 0           UP BROADCAST RUNNING MULTICAST  MTU 1500  Metric 1           RX packets 27734 errors 0 dropped 0 overruns 0 frame 0           TX packets 26393 errors 0 dropped 0 overruns 0 carrier 0           collisions 0 txqueuelen 1000            RX bytes 1924720  1 8 MiB   TX bytes 3841998  3 6 MiB   lo        Link encap Local Loopback             inet addr 127 0 0 1  Mask 255 0 0 0           UP LOOPBACK RUNNING  MTU 65536  Metric 1           RX packets 0 errors 0 dropped 0 overruns 0 frame 0           TX packets 0 errors 0 dropped 0 overruns 0 carrier 0           collisions 0 txqueuelen 0            RX bytes 0  0 0 B   TX bytes 0  0 0 B    GPIOs   ---------- -Rev2- ------ -------- ------ -------    wiringPi   GPIO   Phys   Name     Mode   Value    ---------- ------ ------ -------- ------ -------         0      17     11    GPIO 0   IN     Low            1      18     12    GPIO 1   IN     Low            2      27     13    GPIO 2   IN     Low            3      22     15    GPIO 3   IN     Low            4      23     16    GPIO 4   IN     Low            5      24     18    GPIO 5   IN     Low            6      25     22    GPIO 6   IN     Low            7       4      7    GPIO 7   IN     Low            8       2      3    SDA      IN     High           9       3      5    SCL      IN     High          10       8     24    CE0      IN     Low           11       7     26    CE1      IN     Low           12      10     19    MOSI     IN     Low           13       9     21    MISO     IN     Low           14      11     23    SCLK     IN     Low           15      14      8    TxD      ALT0   High          16      15     10    RxD      ALT0   High          17      28      3    GPIO 8   ALT2   Low           18      29      4    GPIO 9   ALT2   Low           19      30      5    GPIO10   ALT2   Low           20      31      6    GPIO11   ALT2   Low      ---------- ------ ------ -------- ------ -------    simply amazing

User · Answer

Add -q 1 to the netcat command line   while true  do    echo -e  HTTP 1 1 200 OK n n   date     nc -l -p 1500 -q 1 done

User · Answer

mkfifo pipe  while true    do      use read line from pipe to make it blocks before request comes in      this is the key       read line lt pipe echo -e  HTTP 1 1 200 OK r n  echo   date           nc -l -q 0 -p 8080  gt  pipe     done

User · Answer

while true  do  echo -e  HTTP 1 1 200 OK r nConnection  close r n      timeout 1  nc -lp 8080   done  Closes connection after 1 sec  so curl doesn t hang on it

[bash] Minimal web server using netcat

Examples related to bash

Examples related to webserver

Examples related to netcat