michael-o edited a comment on pull request #207:
URL: 
https://github.com/apache/httpcomponents-core/pull/207#issuecomment-669142919


   The test setup is basically a loop which uploads a ZIP file (around 7 MB) to 
a Tomcat 8.5.5x instance. The target URL is auth protected and Tomcat detects 
that really quick, therefore closes the connection. In an optional case, only 
few hundred kilobytes are transfered before HttpClient detects the premature 
end of transfer.
   Tomcat in return responds with 401, `WWW-Authenticate: Negotiate` and the 
usual HTML error page:
   ```
   <!doctype html><html lang="en"><head><title>HTTP Status 401 – 
Unauthorized</title><style type="text/css">body 
{font-family:Tahoma,Arial,sans-serif;} h1, h2, h3, b 
{color:white;background-color:#525D76;} h1 {font-size:22px;} h2 
{font-size:16px;} h3 {font-size:14px;} p {font-size:12px;} a {color:black;} 
.line 
{height:1px;background-color:#525D76;border:none;}</style></head><body><h1>HTTP 
Status 401 – Unauthorized</h1></body></html>
   ```
   
   I am using two connectors, one for plain, one for TLS. Both use APR via 
libtcnative. TLS uses OpenSSL via libtcntative too. I can provide logfiles if 
you like.
   
   After 50 failures of auth, I send an authenticated request which succeeds.


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