curl -v
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Examples
HTTP/1.1 200 OK
curl -v http://localhost:8545 * Trying 127.0.0.1:8545... * Connected to localhost (127.0.0.1) port 8545 (#0) > GET / HTTP/1.1 > Host: localhost:8545 > User-Agent: curl/7.85.0 > Accept: */* > * Mark bundle as not supporting multiuse < HTTP/1.1 200 OK < Date: Mon, 13 Mar 2023 12:59:09 GMT < Content-Length: 0 < * Connection #0 to host localhost left intact
Connection refused
curl http://localhost:8533 curl: (7) Failed to connect to localhost port 8533 after 0 ms: Connection refused
Example
curl -v https://google.com connection
* Trying 172.217.18.110:443... * Connected to google.com (172.217.18.110) port 443 (#0) * ALPN, offering h2 * ALPN, offering http/1.1 * successfully set certificate verify locations: * CAfile: /etc/ssl/cert.pem * CApath: none * (304) (OUT), TLS handshake, Client hello (1): * (304) (IN), TLS handshake, Server hello (2): * (304) (IN), TLS handshake, Unknown (8): * (304) (IN), TLS handshake, Certificate (11): * (304) (IN), TLS handshake, CERT verify (15): * (304) (IN), TLS handshake, Finished (20): * (304) (OUT), TLS handshake, Finished (20): * SSL connection using TLSv1.3 / AEAD-CHACHA20-POLY1305-SHA256 * ALPN, server accepted to use h2 * Server certificate: * subject: CN=*.google.com * start date: Aug 1 08:18:00 2022 GMT * expire date: Oct 24 08:17:59 2022 GMT * subjectAltName: host "google.com" matched cert's "google.com" * issuer: C=US; O=Google Trust Services LLC; CN=GTS CA 1C3 * SSL certificate verify ok. * Using HTTP2, server supports multiplexing * Connection state changed (HTTP/2 confirmed) * Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0 * Using Stream ID: 1 (easy handle 0x141010a00) > GET / HTTP/2 > Host: google.com > user-agent: curl/7.79.1 > accept: */* > < HTTP/2 301 < location: https://www.google.com/ < content-type: text/html; charset=UTF-8 < date: Wed, 24 Aug 2022 05:08:57 GMT < expires: Wed, 24 Aug 2022 05:08:57 GMT < cache-control: private, max-age=2592000 < server: gws < content-length: 220 < x-xss-protection: 0 < x-frame-options: SAMEORIGIN < set-cookie: CONSENT=PENDING+732; expires=Fri, 23-Aug-2024 05:08:57 GMT; path=/; domain=.google.com; Secure < p3p: CP="This is not a P3P policy! See g.co/p3phelp for more info." < alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000,h3-Q050=":443"; ma=2592000,h3-Q046=":443"; ma=2592000,h3-Q043=":443"; ma=2592000,quic=":443"; ma=2592000; v="46,43" < <HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8"> <TITLE>301 Moved</TITLE></HEAD><BODY> <H1>301 Moved</H1> The document has moved <A HREF="https://www.google.com/">here</A>. </BODY></HTML> * Connection #0 to host google.com left intact
curl -v https://google.com failing connection
curl -v https://google.com * processing: https://google.com * Trying 142.250.181.78:443... * Connected to google.com (142.250.181.78) port 443 * ALPN: offers h2,http/1.1 * TLSv1.3 (OUT), TLS handshake, Client hello (1): * CAfile: /etc/ssl/certs/ca-certificates.crt * CApath: /etc/ssl/certs * TLSv1.3 (IN), TLS handshake, Server hello (2): * TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1): * TLSv1.3 (OUT), TLS handshake, Client hello (1): * TLSv1.3 (IN), TLS handshake, Server hello (2): * TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8): * TLSv1.3 (IN), TLS handshake, Certificate (11): * TLSv1.3 (OUT), TLS alert, unknown CA (560): * SSL certificate problem: unable to get local issuer certificate * Closing connection curl: (60) SSL certificate problem: unable to get local issuer certificate More details here: https://curl.se/docs/sslcerts.html curl failed to verify the legitimacy of the server and therefore could not establish a secure connection to it. To learn more about this situation and how to fix it, please visit the web page mentioned above.
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