If the URL address starts with https , then use SSL, otherwise use ordinary HTTP protocol. Is it safe to use HTTPS? In fact, SSL also has different levels of verification. For example, do you need to verify the common name in the certificate? (BTW: Common Name generally means filling in the domain name (domain) or subdomain (sub domain) for which you are going to apply for an SSL certificate.) Need to verify hostname? Do you trust any certificate or only those issued by the CA? If the website's SSL certificate is purchased from a CA (usually more expensive), then you can use stricter authentication when accessing, that is:
If the website’s certificate is generated by itself, or If you apply for it from a small online institution, if you use strict authentication when accessing, it will not pass and false will be returned directly. (By the way, when false is returned, you can print curl_error($ch) to view the specific error message.) At this time, you can reduce the verification level according to the situation to ensure normal access, for example:
When you usually use a browser to access various https websites, you sometimes encounter a prompt that the certificate is not trusted. In fact, this is because the certificates of these websites are not issued by formal CA organizations. Various browsers on the market have built-in CA root certificate list information. When visiting websites with CA-issued certificates, the certificates of these websites will be verified based on the root certificate, so this prompt will not appear. Regarding the CA root certificate file, it actually contains the public key certificates of each major CA organization, which is used to verify whether the website's certificate is issued by these organizations. This file comes from mozilla's source tree and is converted into a PEM format certificate file. (Download http://curl.haxx.se/ca/cacert.pem) Finally, let’s talk about something unrelated to SSL: curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect:')); Mainly to solve the problem of too long data during POST. |

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