failed to build php-zendserver docker on apache httpd

[aareki]

I tried to run PHP 7.3 and it failed to initialize the Zend Server package. Any idea?

Step 11/23 : RUN curl -fSL -o zs-init.tar.gz "http://repos.zend.com/zs-init/zs-init-docker-${ZS_INIT_VERSION}.tar.gz"     && echo "${ZS_INIT_SHA256} *zs-init.tar.gz" | sha256sum -c -     && mkdir /usr/local/zs-init     && tar xzf zs-init.tar.gz --strip-components=1 -C /usr/local/zs-init     && rm zs-init.tar.gz
 ---> Running in 05ecbcd588e1
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
**_curl: (22) The requested URL returned error: 503 Service Unavailable_**
ERROR: Service 'php7.3-zendserver' failed to build: The command '/bin/sh -c curl -fSL -o zs-init.tar.gz "http://repos.zend.com/zs-init/zs-init-docker-${ZS_INIT_VERSION}.tar.gz"     && echo "${ZS_INIT_SHA256} *zs-init.tar.gz" | sha256sum -c -     && mkdir /usr/local/zs-init     && tar xzf zs-init.tar.gz --strip-components=1 -C /usr/local/zs-init     && rm zs-init.tar.gz' 
returned a non-zero code: 22
make: *** [iup] Error 1