getModelStatus() is called in fg.htm.
	It calls a cascade of getModelSizes#() functions [1], 2, 3, 4.

ConSurf: fg.htm skips getModelStatus() since the model is clearly in the ConSurf PDB file.
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How to get info from an API URL:
SEE ALSO EVERNOTE "MMCIF API"

See edmmtd.htm
See getModelSizes() in moldoc.js

Ajax call to an API URL is handled as follows in control2.js within openEDM():

NEWER api uses RCSB, see getModelSizes().
ccp4CheckRoot = "https://www.ebi.ac.uk/pdbe/api/pdb/entry/files/"; // append PDB ID.            
ccp4CheckURL = ccp4CheckRoot + validPDBId;

const http = new XMLHttpRequest()
http.open("GET", ccp4CheckURL);
http.send();
http.onload = function() // called only once. responseText is complete.                         
{
   //alert(http.responseText);                                                                   
   //  if (!match(http.responseText, "ccp4"))
}