AJAX requests are being cancelled after HTTP_STREAM_PARSER_READ_HEADERS
<p>My XMLHttpRequests are being cancelled, yet still seem to successfully work (data gets to the server). Another question recommended looking into the chrome events for a reason, it seems to cancel right after <code>HTTP_STREAM_PARSER_READ_HEADERS</code></p>

<p>Here is the request event, and insight as to what might be causing this, or further troubleshooting I can try?:</p>

<pre><code>t=1125 [st= 0] +REQUEST_ALIVE [dt=250]
t=1125 [st= 0] URL_REQUEST_DELEGATE [dt=0]
t=1125 [st= 0] +URL_REQUEST_START_JOB [dt=250]
--&gt; load_flags = 33024 (MAYBE_USER_GESTURE | VERIFY_EV_CERT)
--&gt; method = "PUT"
--&gt; priority = "LOW"
--&gt; upload_id = "0"
--&gt; url = [Redacted]
t=1125 [st= 0] +URL_REQUEST_DELEGATE [dt=1]
t=1125 [st= 0] DELEGATE_INFO [dt=1]
--&gt; delegate_info = "extension Tampermonkey"
t=1126 [st= 1] -URL_REQUEST_DELEGATE
t=1126 [st= 1] HTTP_CACHE_GET_BACKEND [dt=0]
t=1126 [st= 1] HTTP_CACHE_OPEN_ENTRY [dt=0]
t=1126 [st= 1] HTTP_CACHE_ADD_TO_ENTRY [dt=0]
t=1126 [st= 1] HTTP_CACHE_READ_INFO [dt=0]
t=1126 [st= 1] URL_REQUEST_DELEGATE [dt=0]
t=1126 [st= 1] +HTTP_STREAM_REQUEST [dt=198]
t=1126 [st= 1] HTTP_STREAM_REQUEST_STARTED_JOB
--&gt; source_dependency = 82675 (HTTP_STREAM_JOB)
t=1324 [st=199] HTTP_STREAM_REQUEST_BOUND_TO_JOB
--&gt; source_dependency = 82675 (HTTP_STREAM_JOB)
t=1324 [st=199] -HTTP_STREAM_REQUEST
t=1324 [st=199] +HTTP_TRANSACTION_SEND_REQUEST [dt=0]
t=1324 [st=199] HTTP_TRANSACTION_SEND_REQUEST_HEADERS
--&gt; PUT /users/[Redacted] HTTP/1.1
Host: [Redacted]
Connection: keep-alive
Content-Length: 4545
X-NewRelic-ID: UwUDUlFADQEGUlFb
Origin: [Redacted]
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36
Content-Type: application/json
Accept: /
X-Requested-With: XMLHttpRequest
Referer: [Redacted]
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8
Cookie: [1850 bytes were stripped]
t=1324 [st=199] HTTP_TRANSACTION_SEND_REQUEST_BODY
--&gt; did_merge = false
--&gt; is_chunked = false
--&gt; length = 4545
t=1324 [st=199] -HTTP_TRANSACTION_SEND_REQUEST
t=1324 [st=199] +HTTP_TRANSACTION_READ_HEADERS [dt=51]
t=1324 [st=199] +HTTP_STREAM_PARSER_READ_HEADERS [dt=51]
t=1374 [st=249] CANCELLED
t=1375 [st=250] -URL_REQUEST_START_JOB
--&gt; net_error = -3 (ERR_ABORTED)
t=1375 [st=250] URL_REQUEST_DELEGATE [dt=0]
t=1375 [st=250] -REQUEST_ALIVE
</code></pre>