mime_hdr_find
if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name);
if ((hdr = mime_hdr_find(headers, "content-type")) == NULL