Espressif ESP32-S2 Programming Manual page 593

Chapter 2. API Reference
Helper function for HTTP 408.
Send HTTP 408 message. If you wish to send additional data in the body of the response, please use the
lower-level functions directly.
Note
• This API is supposed to be called only from the context of a URI handler where httpd_req_t* request
pointer is valid.
• Once this API is called, all request headers are purged, so request headers need be copied into
separate buffers if they are required later.
Return
• ESP_OK : On successfully sending the response packet
• ESP_ERR_INVALID_ARG : Null arguments
• ESP_ERR_HTTPD_RESP_SEND : Error in raw send
• ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer
Parameters
• [in] r: The request being responded to
static esp_err_t httpd_resp_send_500(httpd_req_t
Helper function for HTTP 500.
Send HTTP 500 message. If you wish to send additional data in the body of the response, please use the
lower-level functions directly.
Note
• This API is supposed to be called only from the context of a URI handler where httpd_req_t* request
pointer is valid.
• Once this API is called, all request headers are purged, so request headers need be copied into
separate buffers if they are required later.
Return
• ESP_OK : On successfully sending the response packet
• ESP_ERR_INVALID_ARG : Null arguments
• ESP_ERR_HTTPD_RESP_SEND : Error in raw send
• ESP_ERR_HTTPD_INVALID_REQ : Invalid request pointer
Parameters
• [in] r: The request being responded to
int httpd_send(httpd_req_t
Raw HTTP send.
Call this API if you wish to construct your custom response packet. When using this, all essential header, eg.
HTTP version, Status Code, Content Type and Length, Encoding, etc. will have to be constructed manually,
and HTTP delimeters (CRLF) will need to be placed correctly for separating sub-sections of the HTTP response
packet.
If the send override function is set, this API will end up calling that function eventually to send data out.
Note
• This API is supposed to be called only from the context of a URI handler where httpd_req_t* request
pointer is valid.
• Unless the response has the correct HTTP structure (which the user must now ensure) it is not
guaranteed that it will be recognized by the client. For most cases, you wouldn't have to call this
API, but you would rather use either of : httpd_resp_send(), httpd_resp_send_chunk()
Return
• Bytes : Number of bytes that were sent successfully
• HTTPD_SOCK_ERR_INVALID : Invalid arguments
• HTTPD_SOCK_ERR_TIMEOUT : Timeout/interrupted while calling socket send()
• HTTPD_SOCK_ERR_FAIL : Unrecoverable error while calling socket send()
Parameters
• [in] r: The request being responded to
• [in] buf: Buffer from where the fully constructed packet is to be read
• [in] buf_len: Length of the buffer
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*r)
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