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Answers checklist.

I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.

I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.

I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

环境：esp32s3 + esp-idf 5.0
问题：使用正确的证书情况下，使用 esp_http_client api 请求 www.timeapi.io 域名返回200 但获取长度为0。

static void http_redirect_to_https(void) { esp_http_client_config_t config = { .url = "https://www.timeapi.io/api/TimeZone/ip?ipAddress=237.71.232.203", .event_handler = _http_event_handler, .cert_pem = howsmyssl_com_root_cert_pem_start, }; esp_http_client_handle_t client = esp_http_client_init(&config); esp_err_t err = esp_http_client_perform(client); if (err == ESP_OK) { ESP_LOGI(TAG, "HTTP redirect to HTTPS Status = %d, content_length = %lld", esp_http_client_get_status_code(client), esp_http_client_get_content_length(client)); } else { ESP_LOGE(TAG, "Error perform http request %s", esp_err_to_name(err)); } esp_http_client_cleanup(client); }
输出结果：
(9899) HTTP_CLIENT: HTTP redirect to HTTPS Status = 200, content_length = -1 (9899) HTTP_CLIENT: HTTP_EVENT_DISCONNECTED

正确情况:

esp_http_client get 请求https 域名返回200 获取长度为0 esp_http_client get 请求https 域名返回200 获取长度为0 (IDFGH-9299) Feb 2, 2023

@Wvirgil123 这个是 chunked 的数据，没有 content-length 字段，你工具上也显示的是 chunked 的。

我打印 chunk_length 也是为0， 通过perform 方式可以获取到正确的 chunk 长度和数据吗？

if (err == ESP_OK) {
ESP_LOGI(TAG, "HTTP GET Status = %d, content_length = %lld",
esp_http_client_get_status_code(client),
esp_http_client_get_content_length(client));
int len = 0;
bool ret = esp_http_client_is_chunked_response(client);
err = esp_http_client_get_chunk_length(client, &len);
ESP_LOGI(TAG, "is_chunked:%d, chunk_length:%d, ret:%d", ret, len, err);
} else {
ESP_LOGE(TAG, "HTTP GET request failed: %s", esp_err_to_name(err));
return -1;

响应结果：
I (30804) : HTTP GET Status = 200, content_length = -1
I (30804) : is_chunked:1, chunk_length:0, ret:0