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[WebApi_webapp] app.js caching via ETag

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This commit is contained in:
Axel Hinrichs 2022-07-04 16:36:59 +02:00
parent c54846f211
commit 48f540dad1
1 changed files with 23 additions and 0 deletions
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23
src/WebApi_webapp.cpp
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@ -46,8 +46,31 @@ void WebApiWebappClass::init(AsyncWebServer* server)
});
_server->on("/js/app.js", HTTP_GET, [](AsyncWebServerRequest* request) {
#ifdef AUTO_GIT_HASH
// check client If-None-Match header vs ETag/AUTO_GIT_HASH
bool eTagMatch = false;
if(request->hasHeader("If-None-Match")){
AsyncWebHeader* h = request->getHeader("If-None-Match");
if (strncmp(AUTO_GIT_HASH, h->value().c_str(), strlen(AUTO_GIT_HASH)) == 0) {
eTagMatch = true;
}
}
// begin response 200 or 304
AsyncWebServerResponse* response;
if (eTagMatch) {
response = request->beginResponse(304);
} else {
response = request->beginResponse_P(200, "text/javascript", file_app_js_start, file_app_js_end - file_app_js_start);
response->addHeader("Content-Encoding", "gzip");
}
// HTTP requires cache headers in 200 and 304 to be identical
response->addHeader("Cache-Control", "public, must-revalidate");
response->addHeader("ETag", AUTO_GIT_HASH);
#else
AsyncWebServerResponse* response = request->beginResponse_P(200, "text/javascript", file_app_js_start, file_app_js_end - file_app_js_start);
response->addHeader("Content-Encoding", "gzip");
#endif
request->send(response);
});
}