IOS 18 and latest Safari cannot diplay websites with http header Transfer-Encoding chunked #1445
Description
Since upgrading my iPhone to IOS 18 all my ESP32 hosted web sites do not work anymore. The Safari browser only shows a blank page with nothing more than "cannot parse response". The reason seems to be the http header "Transfer-Encoding" with value "chunked" and no content length in the header. This type of headers are produced if a "processor" function is used while generating the response.
Example:
// Route for root / web page
server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/html", index_html, processor);
});
This code results in http headers like this:
"headers": [
{
"name": "Accept-Ranges",
"value": "none"
},
{
"name": "Connection",
"value": "close"
},
{
"name": "Transfer-Encoding",
"value": "chunked"
},
{
"name": "Content-Type",
"value": "text/html"
}
]
Using a code like this (without a processor):
// Route for root / web page
server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/html", index_html);
});
results in http headers like this:
"headers": [
{
"name": "Accept-Ranges",
"value": "none"
},
{
"name": "Connection",
"value": "close"
},
{
"name": "Content-Length",
"value": "1990"
},
{
"name": "Content-Type",
"value": "text/html"
}
]
Such a response can be rendered by Safari. The first one can not.
Thanks
Konrad