quickjs-tart

quickjs-based runtime for wallet-core logic
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CURLOPT_HTTP_VERSION.md (3299B)

      1 ---
      2 c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
      3 SPDX-License-Identifier: curl
      4 Title: CURLOPT_HTTP_VERSION
      5 Section: 3
      6 Source: libcurl
      7 Protocol:
      8   - HTTP
      9 See-also:
     10   - CURLOPT_ALTSVC (3)
     11   - CURLOPT_HTTP09_ALLOWED (3)
     12   - CURLOPT_HTTP200ALIASES (3)
     13   - CURLOPT_SSLVERSION (3)
     14 Added-in: 7.9.1
     15 ---
     16 
     17 # NAME
     18 
     19 CURLOPT_HTTP_VERSION - HTTP protocol version to use
     20 
     21 # SYNOPSIS
     22 
     23 ~~~c
     24 #include <curl/curl.h>
     25 
     26 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP_VERSION, long version);
     27 ~~~
     28 
     29 # DESCRIPTION
     30 
     31 Pass *version* a long, set to one of the values described below. They ask
     32 libcurl to use the specific HTTP versions.
     33 
     34 Note that the HTTP version is just a request. libcurl still prioritizes to
     35 reuse existing connections so it might then reuse a connection using an HTTP
     36 version you have not asked for.
     37 
     38 ## CURL_HTTP_VERSION_NONE
     39 
     40 We do not care about what version the library uses. libcurl uses whatever it
     41 thinks fit.
     42 
     43 ## CURL_HTTP_VERSION_1_0
     44 
     45 Enforce HTTP 1.0 requests.
     46 
     47 ## CURL_HTTP_VERSION_1_1
     48 
     49 Enforce HTTP 1.1 requests.
     50 
     51 ## CURL_HTTP_VERSION_2_0
     52 
     53 Attempt HTTP 2 requests. libcurl falls back to HTTP 1.1 if HTTP 2 cannot be
     54 negotiated with the server. (Added in 7.33.0)
     55 
     56 When libcurl uses HTTP/2 over HTTPS, it does not itself insist on TLS 1.2 or
     57 higher even though that is required by the specification. A user can add this
     58 version requirement with CURLOPT_SSLVERSION(3).
     59 
     60 The alias *CURL_HTTP_VERSION_2* was added in 7.43.0 to better reflect the
     61 actual protocol name.
     62 
     63 ## CURL_HTTP_VERSION_2TLS
     64 
     65 Attempt HTTP 2 over TLS (HTTPS) only. libcurl falls back to HTTP 1.1 if HTTP 2
     66 cannot be negotiated with the HTTPS server. For clear text HTTP servers,
     67 libcurl uses 1.1. (Added in 7.47.0)
     68 
     69 ## CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE
     70 
     71 Issue non-TLS HTTP requests using HTTP/2 without HTTP/1.1 Upgrade. It requires
     72 prior knowledge that the server supports HTTP/2 straight away. HTTPS requests
     73 still do HTTP/2 the standard way with negotiated protocol version in the TLS
     74 handshake. (Added in 7.49.0)
     75 
     76 Since 8.10.0 if this option is set for an HTTPS request then the application
     77 layer protocol version (ALPN) offered to the server is only HTTP/2. Prior to
     78 that both HTTP/1.1 and HTTP/2 were offered.
     79 
     80 ## CURL_HTTP_VERSION_3
     81 
     82 (Added in 7.66.0) This option makes libcurl attempt to use HTTP/3 to the host
     83 given in the URL, with fallback to earlier HTTP versions if needed.
     84 
     85 ## CURL_HTTP_VERSION_3ONLY
     86 
     87 (Added in 7.88.0) Setting this makes libcurl attempt to use HTTP/3 directly to
     88 server given in the URL and does not downgrade to earlier HTTP version if the
     89 server does not support HTTP/3.
     90 
     91 # DEFAULT
     92 
     93 Since curl 7.62.0: CURL_HTTP_VERSION_2TLS
     94 
     95 Before that: CURL_HTTP_VERSION_1_1
     96 
     97 # %PROTOCOLS%
     98 
     99 # EXAMPLE
    100 
    101 ~~~c
    102 int main(void)
    103 {
    104   CURL *curl = curl_easy_init();
    105   if(curl) {
    106     CURLcode ret;
    107     curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    108     curl_easy_setopt(curl, CURLOPT_HTTP_VERSION,
    109                      (long)CURL_HTTP_VERSION_2TLS);
    110     ret = curl_easy_perform(curl);
    111     if(ret == CURLE_HTTP_RETURNED_ERROR) {
    112       /* an HTTP response error problem */
    113     }
    114   }
    115 }
    116 ~~~
    117 
    118 # %AVAILABILITY%
    119 
    120 # RETURN VALUE
    121 
    122 curl_easy_setopt(3) returns a CURLcode indicating success or error.
    123 
    124 CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
    125 libcurl-errors(3).