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CURLOPT_SSL_FALSESTART.3

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    23. 

  23. .TH CURLOPT_SSL_FALSESTART 3 "May 15, 2017" "libcurl 7.61.1" "curl_easy_setopt options"
    24. 

  24. 

  25. .SH NAME
    26. 

  26. CURLOPT_SSL_FALSESTART \- enable TLS false start
    27. 

  27. .SH SYNOPSIS
    28. 

  28. #include <curl/curl.h>
    29. 

  29. 

  30. CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_FALSESTART, long enable);
    31. 

  31. .SH DESCRIPTION
    32. 

  32. Pass a long as parameter set to 1L to enable or 0 to disable.
    33. 

  33. 

  34. This option determines whether libcurl should use false start during the TLS
    35. 

  35. handshake. False start is a mode where a TLS client will start sending
    36. 

  36. application data before verifying the server's Finished message, thus saving a
    37. 

  37. round trip when performing a full handshake.
    38. 

  38. .SH DEFAULT
    39. 

  39. 0
    40. 

  40. .SH PROTOCOLS
    41. 

  41. All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
    42. 

  42. .SH EXAMPLE
    43. 

  43. .nf
    44. 

  44. CURL *curl = curl_easy_init();
    45. 

  45. if(curl) {
    46. 

  46.   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    47. 

  47.   curl_easy_setopt(curl, CURLOPT_SSL_FALSESTART, 1L);
    48. 

  48.   curl_easy_perform(curl);
    49. 

  49. }
    50. 

  50. .fi
    51. 

  51. .SH AVAILABILITY
    52. 

  52. Added in 7.42.0. This option is currently only supported by the NSS and
    53. 

  53. Secure Transport (on iOS 7.0 or later, or OS X 10.9 or later) TLS backends.
    54. 

  54. .SH RETURN VALUE
    55. 

  55. Returns CURLE_OK if false start is supported by the SSL backend, otherwise
    56. 

  56. returns CURLE_NOT_BUILT_IN.
    57.