如何在libcurl

Question

我正在使用CURLOPT_POST发送https消息。在运行期间，我的应用程序停留在：

期待：100-continue

等待100-continue

Answer 1

我刚刚在今天早些时候遇到了这个问题。我发现下面的页面也对此进行了讨论，并建议如何禁用它：

George's Log -- When curl sends 100-continue

尤其是，您可以在放置/发布请求中设置一个空的“期望：”标题。我在curl的回调回调教程中找到了一些示例代码，其中包含带有DISABLE_EXPECT“打喷嚏”防护的以下代码段：

#ifdef DISABLE_EXPECT
/*
  Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue"
  header.  You can disable this header with CURLOPT_HTTPHEADER as usual.
  NOTE: if you want chunked transfer too, you need to combine these two
  since you can only set one list of headers with CURLOPT_HTTPHEADER. */ 

/* A less good option would be to enforce HTTP 1.0, but that might also
   have other implications. */ 
{
  struct curl_slist *chunk = NULL;

  chunk = curl_slist_append(chunk, "Expect:");
  res = curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
  /* use curl_slist_free_all() after the *perform() call to free this
     list again */ 
}
#endif

我保留一个头列表以用于放置/发布请求。将上述内容的等效项添加到该列表中，即可如广告所示：

// Disable Expect: 100-continue
vc->slist = curl_slist_append(vc->slist, "Expect:");
...
curl_easy_setopt(vc->curl, CURLOPT_HTTPHEADER, vc->slist);