OSSL_HTTP_REQ_CTX_new
OSSL_HTTP_REQ_CTX *rctx = OSSL_HTTP_REQ_CTX_new(wbio, rbio, buf_size);
OSSL_HTTP_REQ_CTX *rctx = OSSL_HTTP_REQ_CTX_new(io, io, buf_size);
OSSL_HTTP_REQ_CTX *OSSL_HTTP_REQ_CTX_new(BIO *wbio, BIO *rbio, int buf_size);
OSSL_HTTP_REQ_CTX_new(io, io, buf_size)
rctx = OSSL_HTTP_REQ_CTX_new(wbio, rbio, 8192);