Nixyri/godot
1
0
Fork 0
mirror of https://github.com/godotengine/godot.git synced 2024-11-22 04:06:14 +00:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

[Web] Always return -1 as body length in HTTPClientWeb.

Browse Source 
Body length cannot be reliably retrieved from the web.
Reading the "content-length" value will return a meaningless value when
the response is compressed, as reading will return uncompressed chunks
in any case, resulting in a mismatch between the detected body size and
the actual size returned by repeatedly calling read_response_body_chunk.

Additionally, while "content-length" is considered a safe CORS header,
"content-encoding" is not, so using the "content-encoding" to decide if
"content-length" is meaningful is not an option either.

We simply must accept the fact that browsers are awful when it comes to
networking APIs.
This commit is contained in:
Fabio Alessandrelli 2023-07-24 08:32:44 +02:00
parent 6588a4a29a
commit f4713d235a
4 changed files with 10 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
doc/classes/HTTPClient.xml
View File

@ -41,6 +41,7 @@
<description>
Returns the response's body length.
[b]Note:[/b] Some Web servers may not send a body length. In this case, the value returned will be [code]-1[/code]. If using chunked transfer encoding, the body length will also be [code]-1[/code].
[b]Note:[/b] This function always returns [code]-1[/code] on the Web platform due to browsers limitations.
</description>
</method>
<method name="get_response_code" qualifiers="const">

10
platform/web/http_client_web.cpp
View File

@ -149,7 +149,15 @@ Error HTTPClientWeb::get_response_headers(List<String> *r_response) {
}
int64_t HTTPClientWeb::get_response_body_length() const {
return godot_js_fetch_body_length_get(js_id);
// Body length cannot be consistently retrieved from the web.
// Reading the "content-length" value will return a meaningless value when the response is compressed,
// as reading will return uncompressed chunks in any case, resulting in a mismatch between the detected
// body size and the actual size returned by repeatedly calling read_response_body_chunk.
// Additionally, while "content-length" is considered a safe CORS header, "content-encoding" is not,
// so using the "content-encoding" to decide if "content-length" is meaningful is not an option either.
// We simply must accept the fact that browsers are awful when it comes to networking APIs.
// See GH-47597, and GH-79327.
return -1;
}
PackedByteArray HTTPClientWeb::read_response_body_chunk() {

1
platform/web/http_client_web.h
View File

@ -51,7 +51,6 @@ extern int godot_js_fetch_read_headers(int p_id, void (*parse_callback)(int p_si
extern int godot_js_fetch_read_chunk(int p_id, uint8_t *p_buf, int p_buf_size);
extern void godot_js_fetch_free(int p_id);
extern godot_js_fetch_state_t godot_js_fetch_state_get(int p_id);
extern int godot_js_fetch_body_length_get(int p_id);
extern int godot_js_fetch_http_status_get(int p_id);
extern int godot_js_fetch_is_chunked(int p_id);

15
platform/web/js/libs/library_godot_fetch.js
View File

@ -50,22 +50,17 @@ const GodotFetch = {
return;
}
let chunked = false;
let bodySize = -1;
response.headers.forEach(function (value, header) {
const v = value.toLowerCase().trim();
const h = header.toLowerCase().trim();
if (h === 'transfer-encoding' && v === 'chunked') {
chunked = true;
}
if (h === 'content-length') {
bodySize = parseInt(v, 10);
}
});
obj.status = response.status;
obj.response = response;
obj.reader = response.body.getReader();
obj.chunked = chunked;
obj.bodySize = bodySize;
},
onerror: function (id, err) {
@ -87,7 +82,6 @@ const GodotFetch = {
reading: false,
status: 0,
chunks: [],
bodySize: -1,
};
const id = IDHandler.add(obj);
const init = {
@ -224,15 +218,6 @@ const GodotFetch = {
return p_buf_size - to_read;
},
godot_js_fetch_body_length_get__sig: 'ii',
godot_js_fetch_body_length_get: function (p_id) {
const obj = IDHandler.get(p_id);
if (!obj || !obj.response) {
return -1;
}
return obj.bodySize;
},
godot_js_fetch_is_chunked__sig: 'ii',
godot_js_fetch_is_chunked: function (p_id) {
const obj = IDHandler.get(p_id);