404 error at the json request- Passed all the headers possible but no luck

Question

I am trying to login to an application and it has text/html and some application/json. I am able to login to the application from the previous request but I believe the json is loading some additional data and it is giving me a 404 error. I tried adding the headers as shown below but still no luck. I have attached a snapshot to show the different request headers that are being loaded.

Also, I am not able to correlate cflags, umps session ID as I am not sure where they coming from. I don't see in the server response. Just the headers. Can anyone give me some info here please?

Please let me know if I am missing something.

[//Key  Value Accept    text/javascript, text/html, application/xml, application/json, text/xml, */*
    web_add_header("Accept", "text/javascript, text/html, application/xml, application/json, text/xml, */*");
//Key   Value X-Requested-With  XMLHttpRequest
    web_add_header("X-Requested-With", "XMLHttpRequest");
//Key   Value Content-Type  application/x-www-form-urlencoded
    web_add_header("Content-Type", "application/x-www-form-urlencoded");
//Key   Value Host  0.umps40-c2-was.salesforce.com
    web_add_header("Host", "0.umps40-c2-was.salesforce.com");   
    web_add_header("umpsSessionId", "dummy");
    web_add_header("chanelId", "dummy");
    web_add_header("objectId", "dummy");
    web_add_header("orgID", "dummy");
    web_add_header("sessionId", "dummy");
    web_add_header("Cookie", "BrowserId={BrowserId_1}");
//Key   Value umpsSessionId f4ba5dacfe5785ca04b3372b50d8ea179d4d1e72
//Key   Value User-Agent    Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko
    web_add_header("User-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko");
//Key   Value connectUrl    https://na30.salesforce.com
    web_add_header("connectUrl", "https://na30.salesforce.com");
//Key   Value Request   PUT /api/channel/v28.0/common/sessions/this?cflag=1454473295572 HTTP/1.1
    web_add_header("Request", "PUT /api/channel/v28.0/common/sessions/this?cflag=1454473295572 HTTP/1.1");

    web_submit_data("sessions",
        "Action=https://1.umps40-c2-was.salesforce.com/api/presence/v28.0/common/sessions?cflag=1454434577950", 
        "Method=POST", 
        "TargetFrame=", 
        "RecContentType=application/json", 
        "Referer=https://1.umps40-c2-was.salesforce.com/umps/UMPSWidget_184/_js.html?cflag=184.36&order=2&parentUrl=https://na30.salesforce.com&connectUrl=https://na30.salesforce.com", 
        "Snapshot=t14.inf", 
        "Mode=HTML", 
        ITEMDATA, 
        "Name=data", "Value={}", ENDITEM, 
        LAST);][1]

Answer 1

Record Twice, with all headers. Compare the test code generated. This will be very verbose and differences should show up between the two which are related to the dynamic elements, even in the headers.

Dynamic data has many sources, not all of which are server bound. Session will always have a server component. Look for the value in the generation log. Other items which apparently have no server source then you will likely find are being generated at the client based upon date, time or a transformation of data previously sent from the server.