Curl ssl handshake time. These timings are in seconds.
Curl ssl handshake time. * After 86387ms connect time, move on! * connect to 153.
Curl ssl handshake time g. 07219s Data Transfer: 0. 49). nordea. pem --key mykey. 2. 146 With modern versions of curl, you can simply override which ip-address to connect to, using --resolve or --connect-to (curl newer than version 7. The first 10 steps of the SSL handshake happened twice as fast, but the delay writing during the 'finished' phase took 80% of the total elapsed handshake time. When considering website performance, the term TTFB - time to first byte - crops up regularly. com, and it’s leveraging the CA bundle provided to validate the server’s certificate during the SSL/TLS handshake. All details are in the man page. Request the same URL twice to see the result of Time To First Byte without an SSL handshake: Jan 6, 2023 · DNS Lookup: 0. Breaking down the primary elements of the command: Feb 21, 2024 · dns_resolution == Time to resolve DNS; tcp_established == Time to establish TCP connection; ssl_handshake_done == Time of SSL handshake; TTFB == Time To First Byte; The times are measured in seconds (ssl handshake - tcp time). For example, to override DNS and connect to www. 022, SSL handshake: 0. 2, TLS v1. In this case the server still waits for the end of the HTTP request while your client waits for the server to continue with the SSL handshake. 224. keystore, this problem solved. # At this point, openssl s_client is sitting waiting for you to type something # into stdin. 6w次，点赞3次，收藏15次。通过curl请求示例详解https协议基于https通信是当前互联网最通用便捷的通信方式，简单理解来看可以视为http协议 + ssl/tls协议，通过一个curl的示例阐述一下https协议。 # SSL handshake complete, ready to send HTTP request. This works even with SSL/SNI. ups. My requests are slower from Heroku when compared with a local development server. An important thing worth noting here is that the difference in the numbers for time_appconnect and time_connect time tells us how much time is spent in SSL/TLS handshake. This recipe uses the -v argument to make curl print detailed information about the request and the response. . 096365s SSL Handshake: 0. Lines prefixed by > is the data sent to the server, lines prefixed by < is the data received from the server, and lines starting with * is misc information, such as connection information, SSL handshake information, and protocol information. se ). com # OCSP stapling curl --cert-status https://example. For a cleartext connection without SSL/TLS, time_appconnect is reported as zero. com port 443: Connection timed out With curl, if you explicitly specify the TLS version of the protocol (the one that has a name that ends with an 'S' character) in the URL, curl tries to connect with TLS from start, while if you specify the non-TLS version in the URL you can usually upgrade the connection to TLS-based with the --ssl option. Resolution. Jul 10, 2010 · The time will be displayed with millisecond resolution. However, some of the SSL traffic works (for example https://www. Failures often arise from misconfigurations, outdated protocols, or incompatible cipher suites. Mar 14, 2025 · For more complex scenarios, CURL offers advanced certificate management options that provide greater control over the SSL/TLS handshake process: # Client certificate authentication curl --cert mycert. cURL provides verbose and trace options to reveal handshake details, pinpointing exactly where the secure connection fails Make Curl Verbose curl -v https://catonmat. net. Jan 3, 2016 · My guess is that you attempt to use https against a server:port where https is not available at all. Nov 19, 2021 · curl --trace /path/to/trace. 064 上面命令中的w参数表示指定输出格式，time_connect变量表示TCP握手的耗时，time_appconnect变量表示SSL握手的耗时（更多变量请查看 文档 和 实例 Dec 16, 2016 · curl -w的参数可以获取很多网络访问的细节，其中之一就是可以获取到ssl连接中的tcp handshake和ssl handshake的相关时间： $ curl -w "TCP handshake: %{time_connect}, SSL handshake: %{time_appconnect}\n" -so /dev/null https://www. 3 (OUT), TLS handshake, Client hello (1): The TLS handshake establishes secure communication by exchanging certificates, negotiating ciphers, and confirming trust. 239081s Wait: 1. 文章浏览阅读2. 001439s As A Question of Timing shows, we can measure request timing using cURL: cURL is an excellent tool for debugging web requests, and it includes the ability to take timing measurements. Here is an example output that Mar 26, 2021 · missing intermediate certificate causes this problem, although we can use this webapp projectA normally in browser. com # Certificate pinning curl --pinnedpubkey sha256 How do I debug latency issues using curl? Issue. TLS v1. com with ssl using a particular ip address: (This will also override ipv6) Oct 17, 2018 · Photo by Aron / Unsplash. Check if you can access the exact same URL with https with a browser. 76 port 443 failed: Connection timed out * Failed to connect to onlinetools. 3, curl even prints the corresponding message number from the standard like: == Info: TLSv1. pem https://example. log https://example. Often we see measurements from cURL and Chrome, and this article will show what timings those tools can produce, including time to first byte, and discuss whether this is the measurement you are really looking for. Oct 15, 2023 · In this output, curl is making a secure connection to custom-ca. Summarizing the above tcpdump data for this ssl handshake: 12 packets for SSL, vs 3 for TCP alone ; TCP handshake took 114ms; Total SSL handshake time was 436ms; Number of network round-trips was 3. alipay. These timings are in seconds. 005691s TCP Handshake: 0. example. * After 86387ms connect time, move on! * connect to 153. 031, SSL handshake: 0. com port 443: Connection timed out * Closing connection 0 curl: (7) Failed to connect to onlinetools. There are many possible causes of latency so it's not possible to cover every cause - the following are some suggestions based on common misunderstandings that we see from time to time. com You can then read up on ietf to match the messages from the log to the respective messages from the standard - e. after concat server certificate and intermediate certificate to produce . Sep 24, 2014 · $ curl -w "TCP handshake: %{time_connect}, SSL handshake: %{time_appconnect}\n" -so /dev/null https://www. com TCP handshake: 0. <Elapsed [1816]ms> main, WRITE: TLSv1 Handshake, length = 48 <Elapsed [10078]ms> main, READ: TLSv1 Change Cipher Spec, length = 1 SSLv3, TLS handshake, Client hello (1): It's the same when using the openssl client. bghdw gyj cukjoj ghqte und rfw abwygom pjraoc wvkjx riacahz hvufa bcssk avkf pdqg litp