Hi,
Tomcat version: 9.0.73 Operating system: Unix z/OS System I have a question in regard to the Connector attribute allowHostHeaderMismatch=false which checks the request line is consistent with the Host Header. So in this scenario, I have the request line using the absolute path with a conflicting host header. The response is 400 Bad Request from Tomcat, which makes sense. telnet myhostname.company.com 8143 GET http://myhostname.company.com/api/v1/endpoint HTTP/1.1 Host: facebook.com If I define a valid host header now, then the request is a success. So all is good. telnet myhostname.company.com 8143 GET http://myhostname.company.com/api/v1/endpoint HTTP/1.1 Host: myhostname.company.com telnet 1.1.1.1 8143 GET http://1.1.1.1/api/v1/endpoint HTTP/1.1 Host: 1.1.1.1 However, as soon as I define a port number in the host header with syntax <hostname>:<port> then I get 400 Bad Request from Tomcat. telnet myhostname.company.com 8143 GET http://myhostname.company.com/api/v1/endpoint HTTP/1.1 Host: myhostname.company.com:8143 HTTP/1.1 400 Content-Type: text/html;charset=utf-8 Content-Language: en Content-Length: 762 Date: Fri, 05 May 2023 15:27:09 GMT Connection: close <!doctype html><html lang="en"><head><title>HTTP Status 400 \u2013 Bad Request</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 400 \u2013 Bad Request</h1><hr class="line" /><p><b>Type</b> Status Report</p><p><b>Description</b> The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).</p><hr class="line" /><h3>Apache Tomcat/9.0.73</h3></body></html> This request should be allowed right? Best, Alvaro
