http: The big HTTP API refactoring of January 2025.v2.0.0-alpha.3http-client-trans

This represents a major change in the HTTP code base, consisting
of a complete revamp of the HTTP API. The changes here are too
numerous to mention, but the end result should be a vastly
simpler API for both server and client applications.

Many needless allocations were removed by providing fixed buffers
for various parameters and headers when possible.

A few bugs were fixed. Most especially we have fixed some bugs
around very large URIs and headers, and we have also addressed
conformance bugs to more closely conform to RFCs 9110 and 9112.

As part of this work, the APIs for WebSockets changed slightly
as well.  In particular the properties available for accessing
headers have changed.

There is still documentation conversion work to do, and additional
functionality (such as proper support for chunked transfers), but
this is a big step in the right direction.

1 files changed, 21 insertions, 12 deletions

diff --git a/src/supplemental/http/http_msg.h b/src/supplemental/http/http_msg.h
index 7d9e7dcf..e08dab8a 100644
--- a/src/supplemental/http/http_msg.h
+++ b/src/supplemental/http/http_msg.h
@@ -22,36 +22,45 @@ typedef struct http_header {
 	char         *name;
 	char         *value;
 	nni_list_node node;
+	bool          static_name : 1;  // name is static, do not free it
+	bool          static_value : 1; // value is static, do not free it
+	bool          alloc_header : 1; // header is heap allocated
 } http_header;
+typedef struct http_header nni_http_header;
 
 typedef struct nni_http_entity {
-	char  *data;
-	size_t size; // allocated/expected size
-	size_t len;  // current length
-	bool   own;  // if true, data is "ours", and should be freed
+	char       *data;
+	size_t      size;
+	bool        own;        // if true, data is "ours", and should be freed
+	char        clen[24];   // 64-bit lengths, in decimal
+	char        ctype[128]; // 63+63+; per RFC 6838
+	http_header content_type;
+	http_header content_length;
+	nni_list    hdrs;
+	char       *buf;
+	size_t      bufsz;
+	bool        parsed;
 } nni_http_entity;
 
 struct nng_http_req {
-	nni_list        hdrs;
 	nni_http_entity data;
 	char            meth[32];
+	char            host[260]; // 253 per IETF, plus 6 for :port plus null
+	char            ubuf[200]; // Most URIs are smaller than this
 	char           *uri;
 	const char     *vers;
-	char           *buf;
-	size_t          bufsz;
-	bool            parsed;
+	http_header     host_header;
 };
 
 struct nng_http_res {
-	nni_list        hdrs;
 	nni_http_entity data;
 	uint16_t        code;
 	char           *rsn;
 	const char     *vers;
-	char           *buf;
-	size_t          bufsz;
-	bool            parsed;
 	bool            iserr;
+	http_header     location;
 };
 
+extern void nni_http_free_header(http_header *);
+
 #endif