dotnet-install.sh fails with curl 8.14.0

[mchaves27]

Issue Summary: When installing .NET using the dotnet-install.sh script, the installation fails with the error:
/usr/local/bin/dotnet-install.sh: line 1380: link_types[$link_index]: unbound variable
This issue started occurring after upgrading curl from version 8.13.0 to 8.14.0.

Environment:
Base Image: Red Hat Enterprise Linux (RHEL) 8
Shell: /bin/sh (within Docker build)
dotnet-install.sh Source: Private GitHub Proxy Repository
Previous curl Version (Working): 8.13.0
Current curl Version (Failing): 8.14.0

Steps to reproduce:
Build a Docker image using RHEL 8 as the base.
Add custom curl and dotnet installation:

RUN CURL_SOURCE_URL=$(curl -sSL https://api.github.com/repos/curl/curl/releases/latest | jq -r '.assets[] | select(.name | endswith(".tar.gz")) | .browser_download_url' | sed 's/github\.com/some-private-repository\/repository\/github-proxy/') \
  && curl -sSL $CURL_SOURCE_URL -o curl.tar.gz \
  && tar -xzf curl.tar.gz \
  && rm -f curl.tar.gz \
  && CURL_LOCATION=$(ls -d curl-*/) \
  && pushd ${CURL_LOCATION} \
  && ./configure \
  --enable-static --disable-shared \
  --with-openssl --with-brotli --with-zstd \
  --with-nghttp2 \
  --with-libidn2 --with-libssh2 \
  --enable-hsts --enable-mime --enable-cookies \
  --enable-http-auth --enable-manual \
  --enable-proxy --enable-file --enable-http \
  --enable-ftp --enable-telnet --enable-tftp \
  --enable-pop3 --enable-imap --enable-smtp \
  --enable-gopher --enable-mqtt \
  --enable-doh --enable-dateparse --enable-verbose \
  --enable-alt-svc --enable-websockets \
  --enable-ipv6 --enable-unix-sockets --enable-socketpair \
  --enable-headers-api --enable-versioned-symbols \
  --enable-optimize --enable-pthreads \
  --enable-warnings --enable-werror \
  --enable-curldebug --enable-dict --enable-netrc \
  --enable-bearer-auth --enable-tls-srp --enable-dnsshuffle \
  --enable-get-easy-options --enable-progress-meter \
  --with-ca-bundle=/etc/ssl/certs/ca-bundle.crt \
  --with-ca-path=/etc/ssl/certs \
  --with-ca-fallback \
  --disable-ldap --disable-ldaps \
  && make \
  && make install \
  && popd \
  && rm -rf ${CURL_LOCATION}

# Install dotnet:

curl --retry 10 --retry-all-errors -sSL https://some-private-repository/repository/github-proxy/dotnet/install-scripts/archive/refs/heads/main.zip -o dotnet-install.zip && \
unzip -j dotnet-install.zip install-scripts-main/src/dotnet-install.sh -d /usr/local/bin && \
rm -f dotnet-install.zip && \
chmod +x /usr/local/bin/dotnet-install.sh && \
dotnet-install.sh -c 8.0 && dotnet-install.sh -c 9.0 && \`
dotnet --info

Output for curl installation 8.14.0 :

#17 9.941 Complete!
#17 10.05 curl 8.14.0 (x86_64-pc-linux-gnu) libcurl/8.14.0 OpenSSL/1.1.1k-fips zlib/1.2.11 brotli/1.0.6 zstd/1.4.4 libpsl/0.20.2 libssh2/1.11.1
#17 10.05 Release-Date: 2025-05-28
#17 10.05 Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp ws wss
#17 10.05 Features: alt-svc AsynchDNS brotli HSTS HTTPS-proxy IPv6 Largefile libz NTLM PSL SSL threadsafe TLS-SRP TrackMemory UnixSockets zstd
#17 DONE 10.1s

Output for donet installation :

#21 1.419 Archive:  dotnet-install.zip
#21 1.419 28ba87d0c95854ac6255659209364b7c2b0130e8
#21 1.424   inflating: /usr/local/bin/dotnet-install.sh  
#21 8.137 /usr/local/bin/dotnet-install.sh: line 1380: link_types[$link_index]: unbound variable
#21 ERROR: process "/bin/sh -c curl --retry 10 --retry-all-errors -sSL https://some-private-repositoryt/repository/github-proxy/dotnet/install-scripts/archive/refs/heads/main.zip -o dotnet-install.zip   && unzip -j dotnet-install.zip install-scripts-main/src/dotnet-install.sh -d /usr/local/bin   && rm -f dotnet-install.zip   && chmod +x /usr/local/bin/dotnet-install.sh   && dotnet-install.sh -c 8.0   && dotnet-install.sh -c 9.0   && dotnet --info " did not complete successfully: exit code: 1

Output using curl 8.13.0.

[baronfel]

Can you run the failing dotnet-install invocation with the --verbose flag so we can see detailed diagnostic output?

[mchaves27]

Thanks for the suggestion! Sure, here are the complete logs from the start of the installation process:

1.290   inflating: /usr/local/bin/dotnet-install.sh  
1.315 dotnet-install: Note that the intended use of this script is for Continuous Integration (CI) scenarios, where:
1.315 dotnet-install: - The SDK needs to be installed without user interaction and without admin rights.
1.315 dotnet-install: - The SDK installation doesn't need to persist across multiple CI runs.
1.315 dotnet-install: To set up a development environment or to run apps, use installers rather than this script. Visit https://dotnet.microsoft.com/download to get the installer.
1.317 dotnet-install: Calling: machine_has curl
1.317 dotnet-install: Calling: calculate_vars 
1.322 dotnet-install: Calling: get_normalized_architecture_from_architecture <auto>
1.327 dotnet-install: Calling: get_machine_architecture 
1.332 dotnet-install: Normalized architecture: 'x64'.
1.333 dotnet-install: Calling: get_normalized_os 
1.338 dotnet-install: Calling: get_current_os_name 
1.343 dotnet-install: Calling: get_linux_platform_name 
1.351 dotnet-install: Normalized OS: 'linux'.
1.352 dotnet-install: Calling: get_normalized_quality 
1.357 dotnet-install: Normalized quality: ''.
1.358 dotnet-install: Calling: get_normalized_channel 8.0
1.362 dotnet-install: Normalized channel: '8.0'.
1.363 dotnet-install: Calling: get_normalized_product 
1.368 dotnet-install: Normalized product: 'dotnet-sdk'.
1.369 dotnet-install: Calling: resolve_installation_path <auto>
1.370 dotnet-install: Calling: get_user_install_path 
1.370 dotnet-install: resolve_installation_path: user_install_path=/usr/lib64/dotnet
1.370 dotnet-install: InstallRoot: '/usr/lib64/dotnet'.
1.371 dotnet-install: Calling: get_normalized_architecture_for_specific_sdk_version Latest 8.0 x64
1.374 dotnet-install: Calling: get_current_os_name 
1.379 dotnet-install: Calling: get_linux_platform_name 
1.391 dotnet-install: Calling: get_download_link_from_aka_ms 
1.391 dotnet-install: Retrieving primary payload URL from aka.ms for channel: '8.0', quality: '', product: 'dotnet-sdk', os: 'linux', architecture: 'x64'.
1.391 dotnet-install: Constructed aka.ms link: 'https://aka.ms/dotnet/8.0/dotnet-sdk-linux-x64.tar.gz'.
1.392 dotnet-install: Calling: get_http_header https://aka.ms/dotnet/8.0/dotnet-sdk-linux-x64.tar.gz true
1.392 dotnet-install: Calling: machine_has curl
1.392 dotnet-install: Calling: get_http_header_curl https://aka.ms/dotnet/8.0/dotnet-sdk-linux-x64.tar.gz true
2.268 dotnet-install: Received response: HTTP/1.1 200 Connected
2.268 
2.268 HTTP/1.1 301 Moved Permanently
2.268 Server: Kestrel
2.268 Location: https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.410/dotnet-sdk-8.0.410-linux-x64.tar.gz
2.268 Request-Context: appId=cid-v1:d94c0f68-64bf-4036-8409-a0e761bb7ee1
2.268 X-Response-Cache-Status: True
2.268 Content-Length: 0
2.268 Expires: Tue, 03 Jun 2025 01:32:13 GMT
2.268 Cache-Control: max-age=0, no-cache, no-store
2.268 Pragma: no-cache
2.268 Date: Tue, 03 Jun 2025 01:32:13 GMT
2.268 Connection: keep-alive
2.268 Strict-Transport-Security: max-age=31536000 ; includeSubDomains
2.268 
2.268 HTTP/1.1 200 Connected
2.268 
2.268 HTTP/1.1 200 OK
2.268 Content-Type: application/octet-stream
2.268 Content-MD5: Uaz/eRani77Y/Cf4imRFBA==
2.268 Last-Modified: Thu, 22 May 2025 19:27:56 GMT
2.268 ETag: 0x8DD9966C167BD4E
2.268 x-ms-request-id: 31e97d2a-301e-001b-2541-d05b63000000
2.268 x-ms-version: 2009-09-19
2.268 x-ms-lease-status: unlocked
2.268 x-ms-blob-type: BlockBlob
2.268 Cache-Control: public, max-age=435465
2.268 Date: Tue, 03 Jun 2025 01:32:14 GMT
2.268 Connection: keep-alive
2.268 Content-Length: 216261108
2.268 Akamai-GRN: 0.cdc6cf17.1748914334.1de3cab1
2.268 
2.289 dotnet-install: The aka.ms link 'https://aka.ms/dotnet/8.0/dotnet-sdk-linux-x64.tar.gz' is not valid: received HTTP code: 200,200.
2.289 dotnet-install: Falling back to latest.version file approach.
2.290 dotnet-install: Calling: get_specific_version_from_version https://builds.dotnet.microsoft.com/dotnet 8.0 x64 Latest 
2.295 dotnet-install: Calling: get_version_from_latestversion_file https://builds.dotnet.microsoft.com/dotnet 8.0 x64 false
2.295 dotnet-install: get_version_from_latestversion_file: latest url: https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0/latest.version
2.296 dotnet-install: Calling: download https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0/latest.version
2.296 dotnet-install: Calling: machine_has curl
2.296 dotnet-install: Calling: downloadcurl https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0/latest.version 
2.802 dotnet-install: get_specific_version_from_version: version_info=8.0.410
2.804 dotnet-install: Calling: get_version_from_latestversion_file_content 
2.810 dotnet-install: Calling: get_specific_product_version https://builds.dotnet.microsoft.com/dotnet 8.0.410
2.811 dotnet-install: Calling: get_specific_product_version_url https://builds.dotnet.microsoft.com/dotnet 8.0.410 true 
2.811 dotnet-install: Constructed productVersion link: https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.410/sdk-productVersion.txt
2.812 dotnet-install: Calling: get_specific_product_version_url https://builds.dotnet.microsoft.com/dotnet 8.0.410 false 
2.812 dotnet-install: Constructed productVersion link: https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.410/productVersion.txt
2.813 dotnet-install: Checking for the existence of https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.410/sdk-productVersion.txt
2.813 dotnet-install: Calling: machine_has curl
3.132 dotnet-install: specific_version=8.0.410
3.133 dotnet-install: Calling: construct_download_link https://builds.dotnet.microsoft.com/dotnet 8.0 x64 8.0.410 linux
3.134 dotnet-install: Calling: get_specific_product_version https://builds.dotnet.microsoft.com/dotnet 8.0.410
3.135 dotnet-install: Calling: get_specific_product_version_url https://builds.dotnet.microsoft.com/dotnet 8.0.410 true 
3.135 dotnet-install: Constructed productVersion link: https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.410/sdk-productVersion.txt
3.136 dotnet-install: Calling: get_specific_product_version_url https://builds.dotnet.microsoft.com/dotnet 8.0.410 false 
3.137 dotnet-install: Constructed productVersion link: https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.410/productVersion.txt
3.137 dotnet-install: Checking for the existence of https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.410/sdk-productVersion.txt
3.137 dotnet-install: Calling: machine_has curl
3.395 dotnet-install: Constructed primary named payload URL: https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.410/dotnet-sdk-8.0.410-linux-x64.tar.gz
3.396 dotnet-install: Calling: construct_legacy_download_link https://builds.dotnet.microsoft.com/dotnet 8.0 x64 8.0.410
3.397 dotnet-install: Calling: get_legacy_os_name 
3.403 dotnet-install: Calling: get_legacy_os_name_from_platform rhel.8.10
3.403 dotnet-install: Distribution specific OS name and version could not be detected: UName = Linux
3.404 dotnet-install: Could not construct a legacy_download_link; omitting...
3.404 dotnet-install: Calling: is_dotnet_package_installed /usr/lib64/dotnet sdk 8.0.410
3.406 dotnet-install: Calling: combine_paths /usr/lib64/dotnet sdk
3.408 dotnet-install: combine_paths: root_path=/usr/lib64/dotnet
3.408 dotnet-install: combine_paths: child_path=sdk
3.408 dotnet-install: Calling: combine_paths /usr/lib64/dotnet/sdk 8.0.410
3.410 dotnet-install: combine_paths: root_path=/usr/lib64/dotnet/sdk
3.410 dotnet-install: combine_paths: child_path=8.0.410
3.411 dotnet-install: is_dotnet_package_installed: dotnet_package_path=/usr/lib64/dotnet/sdk/8.0.410
3.412 dotnet-install: Calling: get_specific_version_from_version https://ci.dot.net/public 8.0 x64 Latest 
3.417 dotnet-install: Calling: get_version_from_latestversion_file https://ci.dot.net/public 8.0 x64 false
3.417 dotnet-install: get_version_from_latestversion_file: latest url: https://ci.dot.net/public/Sdk/8.0/latest.version
3.417 dotnet-install: Calling: download https://ci.dot.net/public/Sdk/8.0/latest.version
3.418 dotnet-install: Calling: machine_has curl
3.418 dotnet-install: Calling: downloadcurl https://ci.dot.net/public/Sdk/8.0/latest.version 
3.829 dotnet-install: get_specific_version_from_version: version_info=curl: (35) Recv failure: Connection reset by peer
3.830 dotnet-install: Calling: get_version_from_latestversion_file_content 
3.836 dotnet-install: Calling: get_specific_product_version https://ci.dot.net/public curl: (35) Recv failure: Connection reset by peer
3.837 dotnet-install: Calling: get_specific_product_version_url https://ci.dot.net/public curl: (35) Recv failure: Connection reset by peer true 
3.837 dotnet-install: Constructed productVersion link: https://ci.dot.net/public/Sdk/curl: (35) Recv failure: Connection reset by peer/sdk-productVersion.txt
3.839 dotnet-install: Calling: get_specific_product_version_url https://ci.dot.net/public curl: (35) Recv failure: Connection reset by peer false 
3.839 dotnet-install: Constructed productVersion link: https://ci.dot.net/public/Sdk/curl: (35) Recv failure: Connection reset by peer/productVersion.txt
3.839 dotnet-install: Checking for the existence of https://ci.dot.net/public/Sdk/curl:
3.839 dotnet-install: Calling: machine_has curl
4.015 dotnet-install: Checking for the existence of (35)
4.015 dotnet-install: Calling: machine_has curl
4.025 dotnet-install: Checking for the existence of Recv
4.025 dotnet-install: Calling: machine_has curl
4.196 dotnet-install: Checking for the existence of failure:
4.196 dotnet-install: Calling: machine_has curl
4.207 dotnet-install: Checking for the existence of Connection
4.207 dotnet-install: Calling: machine_has curl
4.305 dotnet-install: Checking for the existence of reset
4.305 dotnet-install: Calling: machine_has curl
4.415 dotnet-install: Checking for the existence of by
4.415 dotnet-install: Calling: machine_has curl
4.539 dotnet-install: Checking for the existence of peer/sdk-productVersion.txt
4.540 dotnet-install: Calling: machine_has curl
4.640 dotnet-install: Checking for the existence of https://ci.dot.net/public/Sdk/curl:
4.640 dotnet-install: Calling: machine_has curl
4.886 dotnet-install: Checking for the existence of (35)
4.886 dotnet-install: Calling: machine_has curl
4.896 dotnet-install: Checking for the existence of Recv
4.896 dotnet-install: Calling: machine_has curl
4.999 dotnet-install: Checking for the existence of failure:
5.000 dotnet-install: Calling: machine_has curl
5.009 dotnet-install: Checking for the existence of Connection
5.009 dotnet-install: Calling: machine_has curl
5.165 dotnet-install: Checking for the existence of reset
5.166 dotnet-install: Calling: machine_has curl
5.261 dotnet-install: Checking for the existence of by
5.261 dotnet-install: Calling: machine_has curl
5.361 dotnet-install: Checking for the existence of peer/productVersion.txt
5.361 dotnet-install: Calling: machine_has curl
5.459 dotnet-install: Failed to get the version using productVersion.txt file. Download link will be parsed instead.
5.459 dotnet-install: Calling: get_product_specific_version_from_download_link  curl: (35) Recv failure: Connection reset by peer
5.460 dotnet-install: specific_version=curl: (35) Recv failure: Connection reset by peer
5.461 dotnet-install: Calling: construct_download_link https://ci.dot.net/public 8.0 x64 curl: (35) Recv failure: Connection reset by peer linux
5.462 dotnet-install: Calling: get_specific_product_version https://ci.dot.net/public curl: (35) Recv failure: Connection reset by peer
5.463 dotnet-install: Calling: get_specific_product_version_url https://ci.dot.net/public curl: (35) Recv failure: Connection reset by peer true 
5.463 dotnet-install: Constructed productVersion link: https://ci.dot.net/public/Sdk/curl: (35) Recv failure: Connection reset by peer/sdk-productVersion.txt
5.465 dotnet-install: Calling: get_specific_product_version_url https://ci.dot.net/public curl: (35) Recv failure: Connection reset by peer false 
5.465 dotnet-install: Constructed productVersion link: https://ci.dot.net/public/Sdk/curl: (35) Recv failure: Connection reset by peer/productVersion.txt
5.465 dotnet-install: Checking for the existence of https://ci.dot.net/public/Sdk/curl:
5.466 dotnet-install: Calling: machine_has curl
5.725 dotnet-install: Checking for the existence of (35)
5.725 dotnet-install: Calling: machine_has curl
5.735 dotnet-install: Checking for the existence of Recv
5.736 dotnet-install: Calling: machine_has curl
5.905 dotnet-install: Checking for the existence of failure:
5.905 dotnet-install: Calling: machine_has curl
5.915 dotnet-install: Checking for the existence of Connection
5.915 dotnet-install: Calling: machine_has curl
6.016 dotnet-install: Checking for the existence of reset
6.016 dotnet-install: Calling: machine_has curl
6.167 dotnet-install: Checking for the existence of by
6.167 dotnet-install: Calling: machine_has curl
6.286 dotnet-install: Checking for the existence of peer/sdk-productVersion.txt
6.286 dotnet-install: Calling: machine_has curl
6.387 dotnet-install: Checking for the existence of https://ci.dot.net/public/Sdk/curl:
6.387 dotnet-install: Calling: machine_has curl
6.666 dotnet-install: Checking for the existence of (35)
6.666 dotnet-install: Calling: machine_has curl
6.677 dotnet-install: Checking for the existence of Recv
6.677 dotnet-install: Calling: machine_has curl
6.780 dotnet-install: Checking for the existence of failure:
6.780 dotnet-install: Calling: machine_has curl
6.791 dotnet-install: Checking for the existence of Connection
6.791 dotnet-install: Calling: machine_has curl
6.901 dotnet-install: Checking for the existence of reset
6.901 dotnet-install: Calling: machine_has curl
6.997 dotnet-install: Checking for the existence of by
6.997 dotnet-install: Calling: machine_has curl
7.161 dotnet-install: Checking for the existence of peer/productVersion.txt
7.161 dotnet-install: Calling: machine_has curl
7.332 dotnet-install: Failed to get the version using productVersion.txt file. Download link will be parsed instead.
7.333 dotnet-install: Calling: get_product_specific_version_from_download_link  curl: (35) Recv failure: Connection reset by peer
7.335 dotnet-install: Constructed primary named payload URL: https://ci.dot.net/public/Sdk/curl: (35) Recv failure: Connection reset by peer/dotnet-sdk-curl: (35) Recv failure: Connection reset by peer-linux-x64.tar.gz
7.335 dotnet-install: Calling: construct_legacy_download_link https://ci.dot.net/public 8.0 x64 curl: (35) Recv failure: Connection reset by peer
7.337 dotnet-install: Calling: get_legacy_os_name 
7.343 dotnet-install: Calling: get_legacy_os_name_from_platform rhel.8.10
7.343 dotnet-install: Distribution specific OS name and version could not be detected: UName = Linux
7.344 dotnet-install: Could not construct a legacy_download_link; omitting...
7.344 dotnet-install: Calling: is_dotnet_package_installed /usr/lib64/dotnet sdk curl: (35) Recv failure: Connection reset by peer
7.345 dotnet-install: Calling: combine_paths /usr/lib64/dotnet sdk
7.347 dotnet-install: combine_paths: root_path=/usr/lib64/dotnet
7.347 dotnet-install: combine_paths: child_path=sdk
7.348 dotnet-install: Calling: combine_paths /usr/lib64/dotnet/sdk curl: (35) Recv failure: Connection reset by peer
7.350 dotnet-install: combine_paths: root_path=/usr/lib64/dotnet/sdk
7.350 dotnet-install: combine_paths: child_path=curl: (35) Recv failure: Connection reset by peer
7.350 dotnet-install: is_dotnet_package_installed: dotnet_package_path=/usr/lib64/dotnet/sdk/curl: (35) Recv failure: Connection reset by peer
7.350 dotnet-install: Generated 16 links.
7.350 dotnet-install: Link 0: primary, 8.0.410, https://builds.dotnet.microsoft.com/dotnet/Sdk/8.0.410/dotnet-sdk-8.0.410-linux-x64.tar.gz
7.350 dotnet-install: Link 1: primary, curl:, https://ci.dot.net/public/Sdk/curl:
7.351 /usr/local/bin/dotnet-install.sh: line 1380: link_types[$link_index]: unbound variable

[baronfel]

@rbhanda this error seems to be happening when the latest.version files aren't found - are those updated like we were talking about yesterday? was this maybe a point-in-time issue with those and not something more systemic with curl?

[martincostello]

Just ran into this myself on Ubuntu 24.04.

RUN curl -L https://dot.net/v1/dotnet-install.sh -o dotnet-install.sh \
  && chmod +x dotnet-install.sh \
  && ./dotnet-install.sh --version "8.0" --runtime dotnet \
  && rm dotnet-install.sh

 > [tests final 6/6] RUN curl -L https://dot.net/v1/dotnet-install.sh -o dotnet-install.sh   && chmod +x dotnet-install.sh   && ./dotnet-install.sh --version "8.0"   && rm dotnet-install.sh:
0.233   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
0.233                                  Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 65133    0 65133    0     0  81839      0 --:--:-- --:--:-- --:--:-- 1382k
8.810 ./dotnet-install.sh: line 1440: effective_versions[$link_index]: unbound variable
------
failed to solve: process "/bin/sh -c curl -L https://dot.net/v1/dotnet-install.sh -o dotnet-install.sh   && chmod +x dotnet-install.sh   && ./dotnet-install.sh --version \"8.0\"   && rm dotnet-install.sh" did not complete successfully: exit code: 1

[martincostello]

curl --version
=> => # 3.3 libpsl/0.21.2 (+libidn2/2.3.3) libssh2/1.10.0 nghttp2/1.52.0 librtmp/2.3 OpenLDAP/2.5.13
 => => # Release-Date: 2023-02-20, security patched: 7.88.1-10+deb12u12
 => => # Protocols: dict file ftp ftps gopher gophers http https imap imaps ldap ldaps mqtt pop3 pop3s rtmp rtsp scp sf
 => => # tp smb smbs smtp smtps telnet tftp
 => => # Features: alt-svc AsynchDNS brotli GSS-API HSTS HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM NTLM_W
 => => # B PSL SPNEGO SSL threadsafe TLS-SRP UnixSockets zstd