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#include "web_server.h"
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#include "web_config.h"
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#include "util.h"
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#include "ntp.h"
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#include "wifi_util.h"
#include "co2_sensor.h"
#include "sensor_console.h"
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#include "csv_writer.h"
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#include "mqtt.h"
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#include "lorawan.h"
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#if defined(ESP8266)
#  include <ESP8266WebServer.h>
#elif defined(ESP32)
#  include <WebServer.h>
#endif
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namespace web_server {

  const char *header_template;
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  const char *body1_template;
  const char *body2_template;
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  const char *script_template;
  void handleWebServerRoot();
  void handlePageNotFound();
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Basic webserver commands    
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  void handleWebServerCommand();
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  void handleDeleteCSV();
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  void handleWebServerCSV();
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  void definePages() {
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    header_template =
        PSTR("<!doctype html><html lang=en>"
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            "<head>"
            "<title>%d ppm - CO2 SENSOR - %s - %s</title>"
            "<meta charset='UTF-8'>"
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            // HfT Favicon
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            "<link rel='icon' type='image/png' sizes='16x16' href='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABHNCSVQICAgIfAhkiAAAAHtJREFUOE9jvMnA+5+BAsBIFQMkl85h+P3kGcOb8jqwW+TPH2H4de0GA29UGNxtfx49YWCRk0HwHz5iuKegwwB2AS4DkA2F6VR6cAWsEQbgBqDY9vARw/ejJ+Au+LxsFcPz6BSwHpwGYPMCSS6gyAAKYhESiKMGjPgwAADopHVhn5ynEwAAAABJRU5ErkJggg=='/>"
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            // Responsive grid:
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            "<link rel='stylesheet' href='https://unpkg.com/purecss@2.0.6/build/pure-min.css'>"
            "<link rel='stylesheet' href='https://unpkg.com/purecss@2.0.6/build/grids-responsive-min.css'>"
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            // JS Graphs:
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            "<script src='https://cdn.plot.ly/plotly-basic-2.9.0.min.js'></script>"
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            // Fullscreen
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            "<meta name='viewport' content='width=device-width, initial-scale=1'>"
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            // Refresh after every measurement.
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            // "<meta http-equiv='refresh' content='%d'>"
            "</head>"
            "<body>"
            "<div class='pure-g'><div class='pure-u-1'><div class='pure-menu'><p class='pure-menu-heading'>HfT-Stuttgart CO<sub>2</sub> Ampel</p></div></div>"
            "<div class='pure-u-1'><ul class='pure-menu pure-menu-horizontal pure-menu-list'>"
            "<li class='pure-menu-item'><a href='/config' class='pure-menu-link'>Config</a></li>"
            "<li class='pure-menu-item'><a href='#table' class='pure-menu-link'>Info</a></li>"
            "<li class='pure-menu-item'><a href='#graph' class='pure-menu-link'>Graph</a></li>"
            "<li class='pure-menu-item'><a href='#log' class='pure-menu-link'>Log</a></li>"
            "<li class='pure-menu-item'><a href='%s' class='pure-menu-link'>Download CSV</a></li>"
            "<li class='pure-menu-item' id='led'>&#11044;</li>"// LED
            "</ul></div></div>"
            "<script>"
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            // Show a colored dot on the webpage, with a similar color than on LED Ring.
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            "hue=(1-(Math.min(Math.max(parseInt(document.title),500),1600)-500)/1100)*120;"
            "document.getElementById('led').style.color=['hsl(',hue,',100%%,50%%)'].join('');"
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            "</script>");

    body1_template = PSTR("<div class='pure-g'>"
        "<div class='pure-u-1' id='graph'></div>" // Graph placeholder
        "</div>"
        "<div class='pure-g'>"
        "<table id='table' class='pure-table-striped pure-u-1 pure-u-md-1-2'>"
        "<tr><th colspan='2'>%s</th></tr>"
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        "<tr><td>CO<sub>2</sub></td><td>%5d ppm</td></tr>"
        "<tr><td>Temperature</td><td>%.1f&#8451;</td></tr>"
        "<tr><td>Humidity</td><td>%.1f%%</td></tr>"
        "<tr><td>Last measurement</td><td>%s</td></tr>"
        "<tr><td>Timestep</td><td>%5d s</td></tr>"
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        "<tbody %s>"
        "<tr><th colspan='2'>CSV</th></tr>"//TODO: Gray out if !config::csv_active
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        "<tr><td>Last write</td><td>%s</td></tr>"
        "<tr><td>Interval</td><td>%5d s</td></tr>"
        "<tr><td>Available space</td><td>%d kB</td></tr>"
        "</tbody>"
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        "<tbody %s>"
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        "<tr><th colspan='2'>MQTT</th></tr>"
        "<tr><td>Connected?</td><td>%s</td></tr>"
        "<tr><td>Last publish</td><td>%s</td></tr>"
        "<tr><td>Interval</td><td>%5d s</td></tr>"
        "</tbody>");
    body2_template =
        PSTR(
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#if defined(ESP32)
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            "<tbody %s>"
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                "<tr><th colspan='2'>LoRaWAN</th></tr>"
                "<tr><td>Connected?</td><td>%s</td></tr>"
                "<tr><td>Frequency</td><td>%s MHz</td></tr>"
                "<tr><td>Last transmission</td><td>%s</td></tr>"
                "<tr><td>Interval</td><td>%5d s</td></tr>"
                "</tbody>"
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#endif
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            "<tr><th colspan='2'>Sensor</th></tr>"
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            "<tr><td>Temperature offset</td><td>%.1fK</td></tr>"
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            "<tr><td>Auto-calibration?</td><td>%s</td></tr>"
            "<tr><td>Local address</td><td><a href='http://%s.local/'>%s.local</a></td></tr>"
            "<tr><td>Local IP</td><td><a href='http://%s'>%s</a></td></tr>"
            "<tr><td>MAC</td><td>%s</td></tr>"
            "<tr><td>Free heap space</td><td>%6d bytes</td></tr>"
            "<tr><td>Largest heap block</td><td>%6d bytes</td></tr>"
            "<tr><td>Frag</td><td>%3d%%</td></tr>"
            "<tr><td>Max loop duration</td><td>%5d ms</td></tr>"
            "<tr><td>Board</td><td>%s</td></tr>"
            "<tr><td>ID</td><td>%s</td></tr>"
            "<tr><td>Ampel firmware</td><td>%s</td></tr>"
            "<tr><td>Uptime</td><td>%2d d %4d h %02d min %02d s</td></tr>"
            "</table>"
            "<div id='log' class='pure-u-1 pure-u-md-1-2'></div>"
            "<form action='/command'><input type='text' id='send' name='send'><input type='submit' value='Send'></form>"
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            "<form action='/delete_csv' method='POST' onsubmit=\"return confirm('Are you really sure you want to delete all data?') && (document.body.style.cursor = 'wait');\">"
            "<input type='submit' value='Delete CSV'/>"
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            "</form>"
            "</div>");
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    script_template =
        PSTR(
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            "<a href='https://transfer.hft-stuttgart.de/gitlab/co2ampel/ampel-firmware' target='_blank'>Source code</a>"
                "<a href='https://transfer.hft-stuttgart.de/gitlab/co2ampel/ampel-documentation' target='_blank'>Documentation</a>"
                "<script>"
                "document.body.style.cursor = 'default';"
                "fetch('%s',{credentials:'include'})"
                ".then(response=>response.text())"
                ".then(csvText=>csvToTable(csvText))"
                ".then(htmlTable=>addLogTableToPage(htmlTable))"
                ".then(_=>Plotly.newPlot('graph',data,layout,{displaylogo:false}))"
                ".catch(e=>console.error(e));"
                "xs=[];"
                "data=[{x:xs,y:[],type:'scatter',name:'CO<sub>2</sub>',line:{color:'#2ca02c'}},"
                "{x:xs,y:[],type:'scatter',name:'Temperature',yaxis:'y2',line:{color:'#ff7f0e',dash:'dot'}},"
                "{x:xs,y:[],type:'scatter',name:'Humidity',yaxis:'y3',line:{color:'#1f77b4',dash:'dot'}}];"
                "layout={height:600,title:'%s',legend:{xanchor:'right',x:0.2,y:1.0},"
                "xaxis:{domain:[0.0,0.85]},yaxis:{ticksuffix:'ppm',range:[0,2000],dtick:200},"
                "yaxis2:{overlaying:'y',side:'right',ticksuffix:'°C',position:0.9,anchor:'free',range:[0,30],dtick:3},"
                "yaxis3:{overlaying:'y',side:'right',ticksuffix:'%%',position:0.95,anchor:'free',range:[0,100],dtick:10}"
                "};"
                "function csvToTable(csvText){"
                "csvText=csvText.trim();"
                "lines=csvText.split('\\n');"
                "table=document.createElement('table');"
                "table.className='pure-table-striped';"
                "n=lines.length;"
                "lines.forEach((line,i)=>{"
                "fields=line.split(';');"
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                //Don't display points without time
                "if (!fields[0].includes('1970-')){"
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                "xs.push(fields[0]);"
                "data[0]['y'].push(fields[1]);"
                "data[1]['y'].push(fields[2]);"
                "data[2]['y'].push(fields[3]);"
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                "};"
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                "if(i>4 && i<n-12){if(i==5){fields=['...','...','...','...']}else{return;}}"
                "row=document.createElement('tr');"
                "fields.forEach((field,index)=>{"
                "cell=document.createElement(i<2?'th':'td');"
                "cell.appendChild(document.createTextNode(field));"
                "row.appendChild(cell);});"
                "table.appendChild(row);});"
                "return table;}"
                "function addLogTableToPage(table){document.getElementById('log').appendChild(table);}"
                "</script>"
                "</body>"
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                "</html>");
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    // Web-server
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    web_config::http.on("/", handleWebServerRoot);
    web_config::http.on("/command", handleWebServerCommand);
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    web_config::http.on(csv_writer::filename, handleWebServerCSV);
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    web_config::http.on("/delete_csv", HTTP_POST, handleDeleteCSV);
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  }
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  /*
   * Allow access if Ampel is in access point mode,
   * if http_user or http_password are empty,
   * or if provided credentials match
   */
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  bool shouldBeAllowed() {
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    return wifi::isAccessPoint() || strcmp(config::http_user, "") == 0 || strcmp(config::ampel_password(), "") == 0
        || web_config::http.authenticate(config::http_user, config::ampel_password());
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  }

  void handleWebServerRoot() {
    if (!shouldBeAllowed()) {
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      return web_config::http.requestAuthentication(DIGEST_AUTH);
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    }

    unsigned long ss = seconds();
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    uint8_t dd = ss / 86400;
    ss -= dd * 86400;
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    unsigned int hh = ss / 3600;
    ss -= hh * 3600;
    uint8_t mm = ss / 60;
    ss -= mm * 60;
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    //NOTE: Splitting in multiple parts in order to use less RAM. Higher than 2000 apparently crashes the ESP8266
    char content[2000];
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    // Current size (with Lorawan):
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    //    INFO - Header size : 1685 - Body1 size : 843 - Body2 size : 1395 - Script size : 1918
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    snprintf_P(content, sizeof(content), header_template, sensor::co2, config::ampel_name(), wifi::local_ip,
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        csv_writer::filename);
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    Serial.print(F("INFO - Header size : "));
    Serial.print(strlen(content));
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    web_config::http.setContentLength(CONTENT_LENGTH_UNKNOWN);
    web_config::http.send_P(200, PSTR("text/html"), content);
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    // Body
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    snprintf_P(content, sizeof(content), body1_template, config::ampel_name(), sensor::co2, sensor::temperature,
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        sensor::humidity, sensor::timestamp, config::measurement_timestep, config::is_csv_active() ? "" : "hidden",
        csv_writer::last_successful_write, config::csv_interval, csv_writer::getAvailableSpace() / 1024,
        config::is_mqtt_active() ? "" : "hidden", mqtt::connected ? "Yes" : "No", mqtt::last_successful_publish,
        config::mqtt_sending_interval);
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    Serial.print(F(" - Body1 size : "));
    Serial.print(strlen(content));
    web_config::http.sendContent(content);

    snprintf_P(content, sizeof(content), body2_template,
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#if defined(ESP32)
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        config::is_lorawan_active() ? "" : "hidden", lorawan::connected ? "Yes" : "No", config::lorawan_frequency_plan,
        lorawan::last_transmission, config::lorawan_sending_interval,
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#endif
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        config::temperature_offset, config::auto_calibrate_sensor ? "Yes" : "No", config::ampel_name(),
        config::ampel_name(), wifi::local_ip, wifi::local_ip, ampel.macAddress, ESP.getFreeHeap(),
        esp_get_max_free_block_size(), esp_get_heap_fragmentation(), ampel.max_loop_duration, ampel.board,
        ampel.sensorId, ampel.version, dd, hh, mm, ss);
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    Serial.print(F(" - Body2 size : "));
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    Serial.print(strlen(content));
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    web_config::http.sendContent(content);
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    // Script
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    snprintf_P(content, sizeof(content), script_template, csv_writer::filename, config::ampel_name());
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    Serial.print(F(" - Script size : "));
    Serial.println(strlen(content));
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    web_config::http.sendContent(content);
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  }

  void handleWebServerCSV() {
    if (!shouldBeAllowed()) {
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      return web_config::http.requestAuthentication(DIGEST_AUTH);
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    }
    if (FS_LIB.exists(csv_writer::filename)) {
      fs::File csv_file = FS_LIB.open(csv_writer::filename, "r");
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      char csv_size[10];
      snprintf(csv_size, sizeof(csv_size), "%d", csv_file.size());
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      web_config::http.sendHeader("Content-Length", csv_size);
      web_config::http.streamFile(csv_file, F("text/csv"));
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      csv_file.close();
    } else {
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      web_config::http.send(204, F("text/html"), F("No data available."));
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    }
  }

  void handleDeleteCSV() {
    if (!shouldBeAllowed()) {
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      return web_config::http.requestAuthentication(DIGEST_AUTH);
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    }
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No String anymore. :)    
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    Serial.print(F("Removing CSV file..."));
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    FS_LIB.remove(csv_writer::filename);
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No String anymore. :)    
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    Serial.println(F(" Done!"));
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Web server refactor    
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    web_config::http.sendHeader("Location", "/");
    web_config::http.send(303);
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  }
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Basic webserver commands    
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  void handleWebServerCommand() {
    if (!shouldBeAllowed()) {
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Web server refactor    
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      return web_config::http.requestAuthentication(DIGEST_AUTH);
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Basic webserver commands    
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    }
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Web server refactor    
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    web_config::http.sendHeader("Location", "/");
    web_config::http.send(303);
    sensor_console::execute(web_config::http.arg("send").c_str());
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Basic webserver commands    
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  }
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  void handlePageNotFound() {
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Web server refactor    
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    web_config::http.send(404, F("text/plain"), F("404: Not found"));
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  }
}

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