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[core] support multiple 1xx responses from backend 

support multiple 1xx intermediate responses from backends

Currently, all 1xx responses from backends are discarded.
In the future, these 1xx responses may be forwarded to the client
(when lighttpd also configured server.stream-response-body = 1 or = 2)
master
Glenn Strauss 2 years ago
parent
7a3098398c
commit
edbfe36563
1 changed files with 58 additions and 47 deletions
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  1. 105
      src/http-header-glue.c

105
src/http-header-glue.c
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@ -275,6 +275,28 @@ void http_response_body_clear (request_st * const r, int preserve_length) {
}
static void http_response_header_clear (request_st * const r) {
r->http_status = 0;
r->resp_htags = 0;
r->resp_header_len = 0;
r->resp_header_repeated = 0;
array_reset_data_strings(&r->resp_headers);
/* Note: http_response_body_clear(r, 0) is not called here
* r->write_queue should be preserved for additional data after 1xx response
* However, if http_response_process_headers() was called and response had
* Transfer-Encoding: chunked set, then other items need to be reset */
r->resp_send_chunked = 0;
r->content_length = -1;
r->resp_decode_chunked = 0;
if (r->gw_dechunk) {
free(r->gw_dechunk->b.ptr);
free(r->gw_dechunk);
r->gw_dechunk = NULL;
}
}
void http_response_reset (request_st * const r) {
r->http_status = 0;
r->con->is_writable = 1;
@ -1163,6 +1185,29 @@ static int http_response_process_headers(request_st * const r, http_response_opt
}
__attribute_cold__
__attribute_noinline__
static int
http_response_check_1xx (request_st * const r, buffer * const restrict b, uint32_t hlen, uint32_t dlen)
{
/* pass through unset r->http_status (not 1xx) or 101 Switching Protocols */
if (0 == r->http_status || 101 == r->http_status)
return 0; /* pass through as-is; do not loop for addtl response hdrs */
/* discard 1xx response from b; already processed
* (but further response might follow in b, so preserve addtl data) */
if (dlen)
memmove(b->ptr, b->ptr+hlen, dlen);
buffer_string_set_length(b, dlen);
/* Note: while GW_AUTHORIZER mode is not expected to return 1xx, as a
* feature, 1xx responses from authorizer are passed back to client */
http_response_header_clear(r);
return 1; /* 1xx response handled; loop for next response headers */
}
__attribute_hot__
__attribute_pure__
static const char *
@ -1176,41 +1221,6 @@ http_response_end_of_header (const char * const restrict ptr)
}
__attribute_cold__
static uint32_t
http_response_discard_1xx (buffer * const restrict b, uint32_t len)
{
char * const ptr = b->ptr;
const char * const n = http_response_end_of_header(ptr+12);
if (NULL == n) return 0; /* * unfinished headers */
/* discard 100 Continue headers */
len -= (uint32_t)(n - ptr);
memmove(ptr, n, len);
buffer_string_set_length(b, len);
return len;
}
__attribute_cold__
__attribute_noinline__
static uint32_t
http_response_check_1xx (buffer * const restrict b, uint32_t len)
{
const char * const s = b->ptr;
while (len > 7 && 0 == memcmp(s, "HTTP/1.", 7)) {
/* discard HTTP/1.1 1xx responses other than 101 Switching Protocols */
if (len > 12
&& s[8] == ' ' && s[9] == '1' && s[10] == '0' && s[11] != '1') {
len = http_response_discard_1xx(b, len);
continue;
}
break;
}
return len;
}
handler_t http_response_parse_headers(request_st * const r, http_response_opts * const opts, buffer * const b) {
/**
* possible formats of response headers:
@ -1232,19 +1242,17 @@ handler_t http_response_parse_headers(request_st * const r, http_response_opts *
* Some users also forget about CGI and just send a response
* and hope we handle it. No headers, no header-content separator
*/
const char *bstart;
uint32_t blen;
uint32_t header_len = buffer_string_length(b);
if (header_len > 12 && b->ptr[9] == '1') {
header_len = http_response_check_1xx(b, header_len);
if (0 == header_len)
return HANDLER_GO_ON; /* unfinished header */
}
do {
blen = buffer_string_length(b);
/*("HTTP/1.1 200 " is at least 13 chars + \r\n)*/
const int is_nph = (header_len > 12 && 0 == memcmp(b->ptr, "HTTP/1.", 7));
const int is_nph = (blen > 12 && 0 == memcmp(b->ptr, "HTTP/1.", 7));
int is_header_end = 0;
uint32_t i = 0, blen;
const char *bstart;
uint32_t i = 0;
if (b->ptr[0] == '\n' || (b->ptr[0] == '\r' && b->ptr[1] == '\n')) {
/* no HTTP headers */
@ -1257,7 +1265,7 @@ handler_t http_response_parse_headers(request_st * const r, http_response_opts *
i = (uint32_t)(n - b->ptr - 1);
is_header_end = 1;
}
} else if (i == header_len) { /* (no newline yet; partial header line?) */
} else if (i == blen) { /* (no newline yet; partial header line?) */
} else if (opts->backend == BACKEND_CGI) {
/* no HTTP headers, but a body (special-case for CGI compat) */
/* no colon found; does not appear to be HTTP headers */
@ -1275,7 +1283,7 @@ handler_t http_response_parse_headers(request_st * const r, http_response_opts *
}
if (!is_header_end) {
if (header_len > MAX_HTTP_RESPONSE_FIELD_SIZE) {
if (blen > MAX_HTTP_RESPONSE_FIELD_SIZE) {
log_error(r->conf.errh, __FILE__, __LINE__,
"response headers too large for %s", r->uri.path.ptr);
r->http_status = 502; /* Bad Gateway */
@ -1287,7 +1295,7 @@ handler_t http_response_parse_headers(request_st * const r, http_response_opts *
/* the body starts after the EOL */
bstart = b->ptr + (i + 1);
blen = header_len - (i + 1);
blen -= (i + 1);
/* strip the last \r?\n */
if (i > 0 && (b->ptr[i - 1] == '\r')) {
@ -1307,6 +1315,9 @@ handler_t http_response_parse_headers(request_st * const r, http_response_opts *
return HANDLER_ERROR;
}
} while (r->http_status < 200
&& http_response_check_1xx(r, b, bstart - b->ptr, blen));
r->resp_body_started = 1;
if (opts->authorizer

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