Closed
Description
Example:
HTTP server (esp8266/Arduino simple HTTP server w/mDNS):
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <ESP8266WebServer.h>
#define WIFI_SSID "YOUR-WIFI-SSID"
#define WIFI_PASSWORD "YOUR-WIFI-PASSWORD"
#define MDNS_HOSTNAME "avahi"
static ESP8266WebServer webServer(80);
void setup() {
Serial.begin(115200);
delay(250);
Serial.print(F("\n\nconnecting to WiFi"));
WiFi.persistent(false);
// WiFiClient::setDefaultNoDelay(false);
// WiFiClient::setDefaultSync(false);
WiFi.mode(WIFI_STA);
WiFi.begin(String(F(WIFI_SSID)).c_str(), String(F(WIFI_PASSWORD)).c_str());
for (; ; delay(500)) {
if (WiFi.status() == WL_CONNECTED)
break;
Serial.print('.');
}
Serial.print(F(", done.\n")); MDNS.begin(String(F(MDNS_HOSTNAME)).c_str());
MDNS.addService(F("http"), F("tcp"), 80);
webServer.onNotFound([]() {
webServer.send(404);
});
webServer.on(F("/"), HTTP_GET, []() {
webServer.sendHeader(F("Location"), String(F("http://" MDNS_HOSTNAME ".local/index.html")));
webServer.send(302);
});
webServer.on(F("/index.html"), HTTP_GET, []() {
webServer.send(200, F("text/html"), F("<!DOCTYPE html><html>"
"<head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"/><title>WiFi HTTP server test</title></head>"
"<body><h1>WiFi HTTP server test</h1><p>hello world</p></body>"
"</html>"));
});
webServer.begin();
}
void loop() {
webServer.handleClient();
}and 2 equivalent HTTP clients... (C# Windows 7/ndp20):
using System;
using System.Diagnostics;
using System.IO;
using System.Net;
namespace httprequest2avahi
{
internal static class Program
{
public static void Main(String[] args)
{
String url = String.Format("http://{0}/index.html", Dns.GetHostAddresses("avahi.local")[0]);
Stopwatch sw = new Stopwatch();
for(Int32 i = 1; ; ++i)
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Timeout = 60000;
req.ReadWriteTimeout = 60000;
req.KeepAlive = false;
req.Pipelined = false;
sw.Reset();
sw.Start();
using(HttpWebResponse res = (HttpWebResponse)req.GetResponse())
{
sw.Stop();
Double d = sw.Elapsed.TotalSeconds;
if(d > 1)
Console.WriteLine("[{0}] req.GetResponse(): {1} seconds", DateTime.Now, d);
if(res.StatusCode != HttpStatusCode.OK)
break;
using(Stream s = res.GetResponseStream())
using(StreamReader sr = new StreamReader(s))
sr.ReadToEnd();
}
Console.Write("connected {0} times\r", i);
}
}
}
}(Python3 Windows 7 or Raspberry Pi 3B):
#!/usr/bin/env python3
import http.client
import itertools
import socket
from datetime import datetime
if __name__ == "__main__":
conn = http.client.HTTPConnection(socket.gethostbyname("avahi.local"), 80, timeout=60)
for i in itertools.count(1):
t = datetime.now()
conn.request("GET", "/index.html")
d = (datetime.now() - t).total_seconds()
if d > 1:
print(" [{}] conn.request(): {} seconds\n".format(t, d))
with conn.getresponse() as res:
if res.status != 200:
break
res.read()
print("connected {} times\r".format(i), end="")On commit 88bd26b (or earlier),
- both 2 abovementioned clients receive responses well (100+ per second)
However on commit 83a8076 ~ 7c91eee,
- C# client receives suddenly slow (2~3 per second), but Pythons well
WiFiClient::setDefaultNoDelay(true)recovers the performance
Moreover on commit 775eb9b,
- C# client performance degradation like the above
WiFiClient::setDefaultNoDelay(true)is ineffective now
Additional Info:
Patched with
});
webServer.on(F("/index.html"), HTTP_GET, []() {
- webServer.send(200, F("text/html"), F("<!DOCTYPE html><html>"
- "<head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"/><title>WiFi HTTP server test</title></head>"
- "<body><h1>WiFi HTTP server test</h1><p>hello world</p></body>"
- "</html>"));
+#define BLOB_SIZE 3996
+ static const char blob[BLOB_SIZE] PROGMEM = { 0 };
+ webServer.send_P(200, PSTR("application/octet-stream"), blob, BLOB_SIZE);
});
webServer.begin();
and then,
#define BLOB_SIZE 3996is OK but3995isn't. Related to MSS or # of packet? (lwIP Variant: "v2 Low Memory")
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