[MacPorts] #63658: curl no longer able to access localhost running Go server

[MacPorts]

#63658: curl no longer able to access localhost running Go server
---------------------+--------------------
 Reporter:  vkuznet  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.1
 Keywords:  curl     |       Port:  curl
---------------------+--------------------
 After recent update of curl I found that it can't access my localhost host
 running Go server. The output I see is the following:
 {{{
 *   Trying 127.0.0.1:8989...
 * Connected to localhost (127.0.0.1) port 8989 (#0)
 > GET /api HTTP/1.1
 > Host: localhost:8989
 > User-Agent: curl/7.78.0
 > Accept: */*
 >
 }}}
 After that it hangs forever. I don't see that request arrive to my server.
 If I use system curl then everything is fine, e.g.
 {{{
 *   Trying ::1...
 * TCP_NODELAY set
 * Connected to localhost (::1) port 8989 (#0)
 > GET /api HTTP/1.1
 > Host: localhost:8989
 > User-Agent: curl/7.64.1
 > Accept: */*
 >
 < HTTP/1.1 200 OK
 ...
 }}}

 I noticed it recently after upgrade of my ports, and previous versions of
 curl were working just fine.

 The difference between macports curl and system one is the following:
 {{{
 /opt/local/bin/curl -V
 curl 7.78.0 (x86_64-apple-darwin20.6.0) libcurl/7.78.0 OpenSSL/1.1.1l
 zlib/1.2.11 zstd/1.5.0 libidn2/2.3.2 libpsl/0.21.1 (+libidn2/2.3.2)
 Release-Date: 2021-07-21
 Protocols: dict file ftp ftps gopher gophers http https imap imaps mqtt
 pop3 pop3s rtsp smb smbs smtp smtps telnet tftp
 Features: alt-svc AsynchDNS HSTS HTTPS-proxy IDN IPv6 Largefile libz NTLM
 NTLM_WB PSL SSL TLS-SRP UnixSockets zstd
 }}}
 and system curl
 {{{
 /usr/bin/curl -V
 curl 7.64.1 (x86_64-apple-darwin20.0) libcurl/7.64.1 (SecureTransport)
 LibreSSL/2.8.3 zlib/1.2.11 nghttp2/1.41.0
 Release-Date: 2019-03-27
 Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3
 pop3s rtsp smb smbs smtp smtps telnet tftp
 Features: AsynchDNS GSS-API HTTP2 HTTPS-proxy IPv6 Kerberos Largefile libz
 MultiSSL NTLM NTLM_WB SPNEGO SSL UnixSockets
 }}}

 Said that, I can access remote sites just fine using either version of
 curl tool

 Thanks,
 Valentin.

-- 
Ticket URL: <https://trac.macports.org/ticket/63658>
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