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godot/core/io/http_client.cpp

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/*************************************************************************/
/* http_client.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "http_client.h"
#include "io/stream_peer_ssl.h"
Error HTTPClient::connect_to_host(const String &p_host, int p_port, bool p_ssl, bool p_verify_host) {
close();
conn_port = p_port;
conn_host = p_host;
if (conn_host.begins_with("http://")) {
conn_host = conn_host.replace_first("http://", "");
} else if (conn_host.begins_with("https://")) {
//use https
conn_host = conn_host.replace_first("https://", "");
}
ssl = p_ssl;
ssl_verify_host = p_verify_host;
connection = tcp_connection;
if (conn_host.is_valid_ip_address()) {
//is ip
Error err = tcp_connection->connect_to_host(IP_Address(conn_host), p_port);
if (err) {
status = STATUS_CANT_CONNECT;
return err;
}
status = STATUS_CONNECTING;
} else {
//is hostname
resolving = IP::get_singleton()->resolve_hostname_queue_item(conn_host);
status = STATUS_RESOLVING;
}
return OK;
}
void HTTPClient::set_connection(const Ref<StreamPeer> &p_connection) {
close();
connection = p_connection;
status = STATUS_CONNECTED;
}
Ref<StreamPeer> HTTPClient::get_connection() const {
return connection;
}
Error HTTPClient::request_raw(Method p_method, const String &p_url, const Vector<String> &p_headers, const PoolVector<uint8_t> &p_body) {
ERR_FAIL_INDEX_V(p_method, METHOD_MAX, ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V(connection.is_null(), ERR_INVALID_DATA);
static const char *_methods[METHOD_MAX] = {
"GET",
"HEAD",
"POST",
"PUT",
"DELETE",
"OPTIONS",
"TRACE",
"CONNECT"
};
String request = String(_methods[p_method]) + " " + p_url + " HTTP/1.1\r\n";
request += "Host: " + conn_host + ":" + itos(conn_port) + "\r\n";
bool add_clen = p_body.size() > 0;
for (int i = 0; i < p_headers.size(); i++) {
request += p_headers[i] + "\r\n";
if (add_clen && p_headers[i].find("Content-Length:") == 0) {
add_clen = false;
}
}
if (add_clen) {
request += "Content-Length: " + itos(p_body.size()) + "\r\n";
//should it add utf8 encoding? not sure
}
request += "\r\n";
CharString cs = request.utf8();
PoolVector<uint8_t> data;
//Maybe this goes faster somehow?
for (int i = 0; i < cs.length(); i++) {
data.append(cs[i]);
}
data.append_array(p_body);
PoolVector<uint8_t>::Read r = data.read();
Error err = connection->put_data(&r[0], data.size());
if (err) {
close();
status = STATUS_CONNECTION_ERROR;
return err;
}
status = STATUS_REQUESTING;
return OK;
}
Error HTTPClient::request(Method p_method, const String &p_url, const Vector<String> &p_headers, const String &p_body) {
ERR_FAIL_INDEX_V(p_method, METHOD_MAX, ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V(connection.is_null(), ERR_INVALID_DATA);
static const char *_methods[METHOD_MAX] = {
"GET",
"HEAD",
"POST",
"PUT",
"DELETE",
"OPTIONS",
"TRACE",
"CONNECT"
};
String request = String(_methods[p_method]) + " " + p_url + " HTTP/1.1\r\n";
request += "Host: " + conn_host + ":" + itos(conn_port) + "\r\n";
bool add_clen = p_body.length() > 0;
for (int i = 0; i < p_headers.size(); i++) {
request += p_headers[i] + "\r\n";
if (add_clen && p_headers[i].find("Content-Length:") == 0) {
add_clen = false;
}
}
if (add_clen) {
request += "Content-Length: " + itos(p_body.utf8().length()) + "\r\n";
//should it add utf8 encoding? not sure
}
request += "\r\n";
request += p_body;
CharString cs = request.utf8();
Error err = connection->put_data((const uint8_t *)cs.ptr(), cs.length());
if (err) {
close();
status = STATUS_CONNECTION_ERROR;
return err;
}
status = STATUS_REQUESTING;
return OK;
}
Error HTTPClient::send_body_text(const String &p_body) {
return OK;
}
Error HTTPClient::send_body_data(const PoolByteArray &p_body) {
return OK;
}
bool HTTPClient::has_response() const {
return response_headers.size() != 0;
}
bool HTTPClient::is_response_chunked() const {
return chunked;
}
int HTTPClient::get_response_code() const {
return response_num;
}
Error HTTPClient::get_response_headers(List<String> *r_response) {
if (!response_headers.size())
return ERR_INVALID_PARAMETER;
for (int i = 0; i < response_headers.size(); i++) {
r_response->push_back(response_headers[i]);
}
response_headers.clear();
return OK;
}
void HTTPClient::close() {
if (tcp_connection->get_status() != StreamPeerTCP::STATUS_NONE)
tcp_connection->disconnect_from_host();
connection.unref();
status = STATUS_DISCONNECTED;
if (resolving != IP::RESOLVER_INVALID_ID) {
IP::get_singleton()->erase_resolve_item(resolving);
resolving = IP::RESOLVER_INVALID_ID;
}
response_headers.clear();
response_str.clear();
body_size = 0;
body_left = 0;
chunk_left = 0;
response_num = 0;
}
Error HTTPClient::poll() {
switch (status) {
case STATUS_RESOLVING: {
ERR_FAIL_COND_V(resolving == IP::RESOLVER_INVALID_ID, ERR_BUG);
IP::ResolverStatus rstatus = IP::get_singleton()->get_resolve_item_status(resolving);
switch (rstatus) {
case IP::RESOLVER_STATUS_WAITING:
return OK; //still resolving
case IP::RESOLVER_STATUS_DONE: {
IP_Address host = IP::get_singleton()->get_resolve_item_address(resolving);
Error err = tcp_connection->connect_to_host(host, conn_port);
IP::get_singleton()->erase_resolve_item(resolving);
resolving = IP::RESOLVER_INVALID_ID;
if (err) {
status = STATUS_CANT_CONNECT;
return err;
}
status = STATUS_CONNECTING;
} break;
case IP::RESOLVER_STATUS_NONE:
case IP::RESOLVER_STATUS_ERROR: {
IP::get_singleton()->erase_resolve_item(resolving);
resolving = IP::RESOLVER_INVALID_ID;
close();
status = STATUS_CANT_RESOLVE;
return ERR_CANT_RESOLVE;
} break;
}
} break;
case STATUS_CONNECTING: {
StreamPeerTCP::Status s = tcp_connection->get_status();
switch (s) {
case StreamPeerTCP::STATUS_CONNECTING: {
return OK; //do none
} break;
case StreamPeerTCP::STATUS_CONNECTED: {
if (ssl) {
Ref<StreamPeerSSL> ssl = StreamPeerSSL::create();
Error err = ssl->connect_to_stream(tcp_connection, true, ssl_verify_host ? conn_host : String());
if (err != OK) {
close();
status = STATUS_SSL_HANDSHAKE_ERROR;
return ERR_CANT_CONNECT;
}
//print_line("SSL! TURNED ON!");
connection = ssl;
}
status = STATUS_CONNECTED;
return OK;
} break;
case StreamPeerTCP::STATUS_ERROR:
case StreamPeerTCP::STATUS_NONE: {
close();
status = STATUS_CANT_CONNECT;
return ERR_CANT_CONNECT;
} break;
}
} break;
case STATUS_CONNECTED: {
//request something please
return OK;
} break;
case STATUS_REQUESTING: {
while (true) {
uint8_t byte;
int rec = 0;
Error err = _get_http_data(&byte, 1, rec);
if (err != OK) {
close();
status = STATUS_CONNECTION_ERROR;
return ERR_CONNECTION_ERROR;
}
if (rec == 0)
return OK; //keep trying!
response_str.push_back(byte);
int rs = response_str.size();
if (
(rs >= 2 && response_str[rs - 2] == '\n' && response_str[rs - 1] == '\n') ||
(rs >= 4 && response_str[rs - 4] == '\r' && response_str[rs - 3] == '\n' && response_str[rs - 2] == '\r' && response_str[rs - 1] == '\n')) {
//end of response, parse.
response_str.push_back(0);
String response;
response.parse_utf8((const char *)response_str.ptr());
//print_line("END OF RESPONSE? :\n"+response+"\n------");
Vector<String> responses = response.split("\n");
body_size = 0;
chunked = false;
body_left = 0;
chunk_left = 0;
response_str.clear();
response_headers.clear();
response_num = RESPONSE_OK;
for (int i = 0; i < responses.size(); i++) {
String header = responses[i].strip_edges();
String s = header.to_lower();
if (s.length() == 0)
continue;
if (s.begins_with("content-length:")) {
body_size = s.substr(s.find(":") + 1, s.length()).strip_edges().to_int();
body_left = body_size;
}
if (s.begins_with("transfer-encoding:")) {
String encoding = header.substr(header.find(":") + 1, header.length()).strip_edges();
//print_line("TRANSFER ENCODING: "+encoding);
if (encoding == "chunked") {
chunked = true;
}
}
if (i == 0 && responses[i].begins_with("HTTP")) {
String num = responses[i].get_slicec(' ', 1);
response_num = num.to_int();
} else {
response_headers.push_back(header);
}
}
if (body_size == 0 && !chunked) {
status = STATUS_CONNECTED; //ask for something again?
} else {
status = STATUS_BODY;
}
return OK;
}
}
//wait for response
return OK;
} break;
case STATUS_DISCONNECTED: {
return ERR_UNCONFIGURED;
} break;
case STATUS_CONNECTION_ERROR: {
return ERR_CONNECTION_ERROR;
} break;
case STATUS_CANT_CONNECT: {
return ERR_CANT_CONNECT;
} break;
case STATUS_CANT_RESOLVE: {
return ERR_CANT_RESOLVE;
} break;
}
return OK;
}
Dictionary HTTPClient::_get_response_headers_as_dictionary() {
List<String> rh;
get_response_headers(&rh);
Dictionary ret;
for (const List<String>::Element *E = rh.front(); E; E = E->next()) {
String s = E->get();
int sp = s.find(":");
if (sp == -1)
continue;
String key = s.substr(0, sp).strip_edges();
String value = s.substr(sp + 1, s.length()).strip_edges();
ret[key] = value;
}
return ret;
}
PoolStringArray HTTPClient::_get_response_headers() {
List<String> rh;
get_response_headers(&rh);
PoolStringArray ret;
ret.resize(rh.size());
int idx = 0;
for (const List<String>::Element *E = rh.front(); E; E = E->next()) {
ret.set(idx++, E->get());
}
return ret;
}
int HTTPClient::get_response_body_length() const {
return body_size;
}
PoolByteArray HTTPClient::read_response_body_chunk() {
ERR_FAIL_COND_V(status != STATUS_BODY, PoolByteArray());
Error err = OK;
if (chunked) {
while (true) {
if (chunk_left == 0) {
//reading len
uint8_t b;
int rec = 0;
err = _get_http_data(&b, 1, rec);
if (rec == 0)
break;
chunk.push_back(b);
if (chunk.size() > 32) {
ERR_PRINT("HTTP Invalid chunk hex len");
status = STATUS_CONNECTION_ERROR;
return PoolByteArray();
}
if (chunk.size() > 2 && chunk[chunk.size() - 2] == '\r' && chunk[chunk.size() - 1] == '\n') {
int len = 0;
for (int i = 0; i < chunk.size() - 2; i++) {
char c = chunk[i];
int v = 0;
if (c >= '0' && c <= '9')
v = c - '0';
else if (c >= 'a' && c <= 'f')
v = c - 'a' + 10;
else if (c >= 'A' && c <= 'F')
v = c - 'A' + 10;
else {
ERR_PRINT("HTTP Chunk len not in hex!!");
status = STATUS_CONNECTION_ERROR;
return PoolByteArray();
}
len <<= 4;
len |= v;
if (len > (1 << 24)) {
ERR_PRINT("HTTP Chunk too big!! >16mb");
status = STATUS_CONNECTION_ERROR;
return PoolByteArray();
}
}
if (len == 0) {
//end!
status = STATUS_CONNECTED;
chunk.clear();
return PoolByteArray();
}
chunk_left = len + 2;
chunk.resize(chunk_left);
}
} else {
int rec = 0;
err = _get_http_data(&chunk[chunk.size() - chunk_left], chunk_left, rec);
if (rec == 0) {
break;
}
chunk_left -= rec;
if (chunk_left == 0) {
if (chunk[chunk.size() - 2] != '\r' || chunk[chunk.size() - 1] != '\n') {
ERR_PRINT("HTTP Invalid chunk terminator (not \\r\\n)");
status = STATUS_CONNECTION_ERROR;
return PoolByteArray();
}
PoolByteArray ret;
ret.resize(chunk.size() - 2);
{
PoolByteArray::Write w = ret.write();
copymem(w.ptr(), chunk.ptr(), chunk.size() - 2);
}
chunk.clear();
return ret;
}
break;
}
}
} else {
int to_read = MIN(body_left, read_chunk_size);
PoolByteArray ret;
ret.resize(to_read);
int _offset = 0;
while (to_read > 0) {
int rec = 0;
{
PoolByteArray::Write w = ret.write();
err = _get_http_data(w.ptr() + _offset, to_read, rec);
}
if (rec > 0) {
body_left -= rec;
to_read -= rec;
_offset += rec;
} else {
if (to_read > 0) //ended up reading less
ret.resize(_offset);
break;
}
}
if (body_left == 0) {
status = STATUS_CONNECTED;
}
return ret;
}
if (err != OK) {
close();
if (err == ERR_FILE_EOF) {
status = STATUS_DISCONNECTED; //server disconnected
} else {
status = STATUS_CONNECTION_ERROR;
}
} else if (body_left == 0 && !chunked) {
status = STATUS_CONNECTED;
}
return PoolByteArray();
}
HTTPClient::Status HTTPClient::get_status() const {
return status;
}
void HTTPClient::set_blocking_mode(bool p_enable) {
blocking = p_enable;
}
bool HTTPClient::is_blocking_mode_enabled() const {
return blocking;
}
Error HTTPClient::_get_http_data(uint8_t *p_buffer, int p_bytes, int &r_received) {
if (blocking) {
Error err = connection->get_data(p_buffer, p_bytes);
if (err == OK)
r_received = p_bytes;
else
r_received = 0;
return err;
} else {
return connection->get_partial_data(p_buffer, p_bytes, r_received);
}
}
void HTTPClient::_bind_methods() {
ClassDB::bind_method(D_METHOD("connect_to_host:Error", "host", "port", "use_ssl", "verify_host"), &HTTPClient::connect_to_host, DEFVAL(false), DEFVAL(true));
ClassDB::bind_method(D_METHOD("set_connection", "connection:StreamPeer"), &HTTPClient::set_connection);
ClassDB::bind_method(D_METHOD("get_connection:StreamPeer"), &HTTPClient::get_connection);
ClassDB::bind_method(D_METHOD("request_raw", "method", "url", "headers", "body"), &HTTPClient::request_raw);
ClassDB::bind_method(D_METHOD("request", "method", "url", "headers", "body"), &HTTPClient::request, DEFVAL(String()));
ClassDB::bind_method(D_METHOD("send_body_text", "body"), &HTTPClient::send_body_text);
ClassDB::bind_method(D_METHOD("send_body_data", "body"), &HTTPClient::send_body_data);
ClassDB::bind_method(D_METHOD("close"), &HTTPClient::close);
ClassDB::bind_method(D_METHOD("has_response"), &HTTPClient::has_response);
ClassDB::bind_method(D_METHOD("is_response_chunked"), &HTTPClient::is_response_chunked);
ClassDB::bind_method(D_METHOD("get_response_code"), &HTTPClient::get_response_code);
ClassDB::bind_method(D_METHOD("get_response_headers"), &HTTPClient::_get_response_headers);
ClassDB::bind_method(D_METHOD("get_response_headers_as_dictionary"), &HTTPClient::_get_response_headers_as_dictionary);
ClassDB::bind_method(D_METHOD("get_response_body_length"), &HTTPClient::get_response_body_length);
ClassDB::bind_method(D_METHOD("read_response_body_chunk"), &HTTPClient::read_response_body_chunk);
ClassDB::bind_method(D_METHOD("set_read_chunk_size", "bytes"), &HTTPClient::set_read_chunk_size);
ClassDB::bind_method(D_METHOD("set_blocking_mode", "enabled"), &HTTPClient::set_blocking_mode);
ClassDB::bind_method(D_METHOD("is_blocking_mode_enabled"), &HTTPClient::is_blocking_mode_enabled);
ClassDB::bind_method(D_METHOD("get_status"), &HTTPClient::get_status);
ClassDB::bind_method(D_METHOD("poll:Error"), &HTTPClient::poll);
ClassDB::bind_method(D_METHOD("query_string_from_dict:String", "fields"), &HTTPClient::query_string_from_dict);
BIND_CONSTANT(METHOD_GET);
BIND_CONSTANT(METHOD_HEAD);
BIND_CONSTANT(METHOD_POST);
BIND_CONSTANT(METHOD_PUT);
BIND_CONSTANT(METHOD_DELETE);
BIND_CONSTANT(METHOD_OPTIONS);
BIND_CONSTANT(METHOD_TRACE);
BIND_CONSTANT(METHOD_CONNECT);
BIND_CONSTANT(METHOD_MAX);
BIND_CONSTANT(STATUS_DISCONNECTED);
BIND_CONSTANT(STATUS_RESOLVING); //resolving hostname (if passed a hostname)
BIND_CONSTANT(STATUS_CANT_RESOLVE);
BIND_CONSTANT(STATUS_CONNECTING); //connecting to ip
BIND_CONSTANT(STATUS_CANT_CONNECT);
BIND_CONSTANT(STATUS_CONNECTED); //connected ); requests only accepted here
BIND_CONSTANT(STATUS_REQUESTING); // request in progress
BIND_CONSTANT(STATUS_BODY); // request resulted in body ); which must be read
BIND_CONSTANT(STATUS_CONNECTION_ERROR);
BIND_CONSTANT(STATUS_SSL_HANDSHAKE_ERROR);
BIND_CONSTANT(RESPONSE_CONTINUE);
BIND_CONSTANT(RESPONSE_SWITCHING_PROTOCOLS);
BIND_CONSTANT(RESPONSE_PROCESSING);
// 2xx successful
BIND_CONSTANT(RESPONSE_OK);
BIND_CONSTANT(RESPONSE_CREATED);
BIND_CONSTANT(RESPONSE_ACCEPTED);
BIND_CONSTANT(RESPONSE_NON_AUTHORITATIVE_INFORMATION);
BIND_CONSTANT(RESPONSE_NO_CONTENT);
BIND_CONSTANT(RESPONSE_RESET_CONTENT);
BIND_CONSTANT(RESPONSE_PARTIAL_CONTENT);
BIND_CONSTANT(RESPONSE_MULTI_STATUS);
BIND_CONSTANT(RESPONSE_IM_USED);
// 3xx redirection
BIND_CONSTANT(RESPONSE_MULTIPLE_CHOICES);
BIND_CONSTANT(RESPONSE_MOVED_PERMANENTLY);
BIND_CONSTANT(RESPONSE_FOUND);
BIND_CONSTANT(RESPONSE_SEE_OTHER);
BIND_CONSTANT(RESPONSE_NOT_MODIFIED);
BIND_CONSTANT(RESPONSE_USE_PROXY);
BIND_CONSTANT(RESPONSE_TEMPORARY_REDIRECT);
// 4xx client error
BIND_CONSTANT(RESPONSE_BAD_REQUEST);
BIND_CONSTANT(RESPONSE_UNAUTHORIZED);
BIND_CONSTANT(RESPONSE_PAYMENT_REQUIRED);
BIND_CONSTANT(RESPONSE_FORBIDDEN);
BIND_CONSTANT(RESPONSE_NOT_FOUND);
BIND_CONSTANT(RESPONSE_METHOD_NOT_ALLOWED);
BIND_CONSTANT(RESPONSE_NOT_ACCEPTABLE);
BIND_CONSTANT(RESPONSE_PROXY_AUTHENTICATION_REQUIRED);
BIND_CONSTANT(RESPONSE_REQUEST_TIMEOUT);
BIND_CONSTANT(RESPONSE_CONFLICT);
BIND_CONSTANT(RESPONSE_GONE);
BIND_CONSTANT(RESPONSE_LENGTH_REQUIRED);
BIND_CONSTANT(RESPONSE_PRECONDITION_FAILED);
BIND_CONSTANT(RESPONSE_REQUEST_ENTITY_TOO_LARGE);
BIND_CONSTANT(RESPONSE_REQUEST_URI_TOO_LONG);
BIND_CONSTANT(RESPONSE_UNSUPPORTED_MEDIA_TYPE);
BIND_CONSTANT(RESPONSE_REQUESTED_RANGE_NOT_SATISFIABLE);
BIND_CONSTANT(RESPONSE_EXPECTATION_FAILED);
BIND_CONSTANT(RESPONSE_UNPROCESSABLE_ENTITY);
BIND_CONSTANT(RESPONSE_LOCKED);
BIND_CONSTANT(RESPONSE_FAILED_DEPENDENCY);
BIND_CONSTANT(RESPONSE_UPGRADE_REQUIRED);
// 5xx server error
BIND_CONSTANT(RESPONSE_INTERNAL_SERVER_ERROR);
BIND_CONSTANT(RESPONSE_NOT_IMPLEMENTED);
BIND_CONSTANT(RESPONSE_BAD_GATEWAY);
BIND_CONSTANT(RESPONSE_SERVICE_UNAVAILABLE);
BIND_CONSTANT(RESPONSE_GATEWAY_TIMEOUT);
BIND_CONSTANT(RESPONSE_HTTP_VERSION_NOT_SUPPORTED);
BIND_CONSTANT(RESPONSE_INSUFFICIENT_STORAGE);
BIND_CONSTANT(RESPONSE_NOT_EXTENDED);
}
void HTTPClient::set_read_chunk_size(int p_size) {
ERR_FAIL_COND(p_size < 256 || p_size > (1 << 24));
read_chunk_size = p_size;
}
String HTTPClient::query_string_from_dict(const Dictionary &p_dict) {
String query = "";
Array keys = p_dict.keys();
for (int i = 0; i < keys.size(); ++i) {
query += "&" + String(keys[i]).http_escape() + "=" + String(p_dict[keys[i]]).http_escape();
}
query.erase(0, 1);
return query;
}
HTTPClient::HTTPClient() {
tcp_connection = StreamPeerTCP::create_ref();
resolving = IP::RESOLVER_INVALID_ID;
status = STATUS_DISCONNECTED;
conn_port = 80;
body_size = 0;
chunked = false;
body_left = 0;
chunk_left = 0;
response_num = 0;
ssl = false;
blocking = false;
read_chunk_size = 4096;
}
HTTPClient::~HTTPClient() {
}
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