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Added serveStatic example with template

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Mathieu Carbou
2024-10-30 09:55:34 +01:00
parent 8ce30ac7e6
commit 5a60a3de6c
1 changed files with 44 additions and 1 deletions
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45
examples/SimpleServer/SimpleServer.ino
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@@ -87,6 +87,18 @@ const char* htmlContent PROGMEM = R"(
</html> </html>
)"; )";
const char* staticContent PROGMEM = R"(
<!DOCTYPE html>
<html>
<head>
<title>Sample HTML</title>
</head>
<body>
<h1>Hello, %IP%</h1>
</body>
</html>
)";
AsyncWebServer server(80); AsyncWebServer server(80);
AsyncEventSource events("/events"); AsyncEventSource events("/events");
AsyncWebSocket ws("/ws"); AsyncWebSocket ws("/ws");
@@ -203,7 +215,7 @@ void setup() {
LittleFS.begin(); LittleFS.begin();
#endif #endif
if (!LittleFS.exists("/index.txt")) { {
File f = LittleFS.open("/index.txt", "w"); File f = LittleFS.open("/index.txt", "w");
if (f) { if (f) {
for (size_t c = 0; c < sizeof(characters); c++) { for (size_t c = 0; c < sizeof(characters); c++) {
@@ -215,6 +227,14 @@ void setup() {
} }
} }
{
File f = LittleFS.open("/index.html", "w");
if (f) {
f.print(staticContent);
f.close();
}
}
// curl -v -X GET http://192.168.4.1/handler-not-sending-response // curl -v -X GET http://192.168.4.1/handler-not-sending-response
server.on("/handler-not-sending-response", HTTP_GET, [](AsyncWebServerRequest* request) { server.on("/handler-not-sending-response", HTTP_GET, [](AsyncWebServerRequest* request) {
// handler forgot to send a response to the client => 501 Not Implemented // handler forgot to send a response to the client => 501 Not Implemented
@@ -392,6 +412,29 @@ void setup() {
// curl -v -X GET http://192.168.4.1/index.txt // curl -v -X GET http://192.168.4.1/index.txt
server.serveStatic("/index.txt", LittleFS, "/index.txt"); server.serveStatic("/index.txt", LittleFS, "/index.txt");
// ServeStatic static is used to serve static output which never changes over time.
// This special endpoints automatyically adds caching headers.
// If a template processor is used, it must enure that the outputed content will always be the ame over time and never changes.
// Otherwise, do not use serveStatic.
// Example below: IP never changes.
// curl -v -X GET http://192.168.4.1/index-static.html
server.serveStatic("/index-static.html", LittleFS, "/index.html").setTemplateProcessor([](const String& var) -> String {
if (var == "IP")
return WiFi.localIP().toString();
return emptyString;
});
// to serve a template with dynamic content (output changes over time), use normal
// Example below: content changes over tinme do not use serveStatic.
// curl -v -X GET http://192.168.4.1/index-dynamic.html
server.on("/index-dynamic.html", HTTP_GET, [](AsyncWebServerRequest* request) {
request->send(LittleFS, "/index.html", "text/html", false, [](const String& var) -> String {
if (var == "IP")
return String(random(0, 1000));
return emptyString;
});
});
// Issue #14: assert failed: tcp_update_rcv_ann_wnd (needs help to test fix) // Issue #14: assert failed: tcp_update_rcv_ann_wnd (needs help to test fix)
// > curl -v http://192.168.4.1/issue-14 // > curl -v http://192.168.4.1/issue-14
pinMode(4, OUTPUT); pinMode(4, OUTPUT);