Question Text/event streaming: Outputs chat answers streamed.

[Ultaschall4D]

Server operating system version

Ubuntu 22.04.5 LTS

Plesk version and microupdate number

Plesk Obsidian v18.0.64_build1800241008.13 os_Ubuntu 22.04

Hello everyone!
I am building a chatbot. The chat outputs the answers streamed. Now I'm trying to get it running on a Plesk system. But somehow the text/event streaming is not working. All replies are returned completely, I have already disabled gzip, but also without success. Apache + nginx as reverse proxy server (nginx). How do I get streaming responses?

I have:
output buffering have be disabled in php.ini config
output_buffering = Off zlib.output_compression = Off
Apache gzip module is disabled. You can disable this through Apache config files or by adding the following lines to the `/public/.htaccess` file:s
<IfModule mod_headers.c> RewriteRule ^(.*)$ $1 [NS,E=no-gzip:1,E=dont-vary:1] </IfModule>

... Also, perhabs noting that if you’re using Nginx as a proxy on Apache, the streaming issue might be related to the Nginx configuration?


Can anyone help me?

 

[Azurel]

I have the same question. I use in JavaScript EventSource() with response from php as "text/event-stream" and offline in my XAMPP all working fine. Online its not working, its pending and and all replies return at end.

My test case:

<?php
header('Content-Type: text/event-stream');
header('Cache-Control: no-cache');
header('Connection: keep-alive');
header('X-Accel-Buffering: no');

while (ob_get_level() > 0) {
    ob_end_flush();
}
if (function_exists('apache_setenv')) {
    @apache_setenv('no-gzip', '1');
}
@ini_set('zlib.output_compression', 'Off');
@ini_set('output_buffering', 'Off');
@ini_set('implicit_flush', 'On');

$counter = 0;
while (true) {
    if (connection_aborted()) {
        break;
    }

    $curDate = date(DATE_ISO8601);
    echo "event: ping\n";
    echo "data: {\"time\": \"{$curDate}\", \"count\": {$counter}}\n\n";

    while (ob_get_level() > 0) {
        ob_end_flush();
    }
    flush();

    $counter++;

    if ($counter > 2) {
        break;
    }
    sleep(2);
}
?>

and in command-line I call
# curl -vN https://www.example.com/test.php

It will only display all outputs once it has run through completely.

I tried nginx setting

location ~* /(test|test2)\.php$ {
proxy_pass https://myip:7081

proxy_buffering off;
proxy_request_buffering off;
proxy_cache off;
gzip off;

add_header Cache-Control no-cache;
add_header Content-Type text/event-stream;
add_header Alt-Svc 'h2=":443"; ma=0';

proxy_read_timeout 610s;
proxy_send_timeout 610s;

proxy_http_version 1.1;
proxy_set_header Connection '';
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}

not helps. I add for apache:

<Files "test.php">
SetEnv no-gzip dont-vary
</Files>

This did not help either.

What do you have to do here so that a certain script works on the domain with Content-Type: text/event-stream?
Does anyone have experience with this and can help me (and Ultaschall4D)?