Here are the data structures with brief descriptions:

Catomic_bool_t
Ccli_options_t
Cconnection_pool
Cconnection_pool_manager_t
Ccookie	HTTP cookie structure
Ccookie_binary_header_t	Binary format header for individual cookies
Ccookie_domain_bucket	Domain bucket for cookie storage
Ccookie_iterator	Cookie iterator implementation
Ccookie_jar	Cookie jar implementation
Ccookie_jar_binary_header_t	Binary format header for cookie jar files
Ccookie_jar_config_t	Cookie jar configuration
Ccookie_match	Cookie match result
Cdns_address_t	Structure representing a resolved network address
Cdns_config_t	Configuration structure for DNS resolver
Cdns_request	Internal DNS request structure
Cdns_resolver	Internal DNS resolver structure
Cdns_result_t	Structure containing DNS resolution results
Cfetch_abort_controller	Abort controller for cancelling requests
Cfetch_body_t	Request or response body
Cfetch_config	Global configuration for the fetch library
Cfetch_connection
Cfetch_event_loop
Cfetch_headers	HTTP headers container
Cfetch_headers_iterator_t	Iterator for traversing headers
Cfetch_init	Request configuration options
Cfetch_promise	Promise for asynchronous fetch operations
Cfetch_readable_stream
Cfetch_readable_stream_controller
Cfetch_request
Cfetch_response	HTTP response object
Cfetch_stream_chunk_t
Cfetch_stream_reader
Cfetch_stream_writer
Cfetch_timer
Cfetch_transform_stream
Cfetch_url
Cfetch_url_search_params	URL search parameters container
Cfetch_url_search_params_iterator_t	Iterator for URL search parameters
Cfetch_writable_stream
Chttp_parse_context
Clock_free_ring_buffer_t
Cphr_chunked_decoder
Cphr_header
Cpooled_connection
Cstream_buffer_t
Ctls_context