且构网

分享程序员开发的那些事...
且构网 - 分享程序员编程开发的那些事
您所在的位置：首页 > Boost asio:无法读取URL正文(JSON)

Boost asio:无法读取URL正文(JSON)

更新时间：2023-01-12 17:20:40

问题的实质是双重的:

  • 首先，存在未定义的行为，因为您无法在其中捕获bufptr完成处理程序，这意味着在syscall向其写入数据时已经释放了向量...

  • firstly, there is Undefined Behaviour because you fail to capture bufptr in the completion handler, meaning that the vector is already freed by the time that the syscall is writing to it...

其次，您正在垃圾邮件"正文的第一部分，因为在阅读标题时已经收到了它.您应该添加代码以保留在read_next_line中已经收到的零件.

Secondly, you're "junking" the first part of the body, as you have already received it when reading the headers. You should add code to preserve the part that was already received in read_next_line.

真正的误导"可能是在使用

The real "misguidance" is probably in the use of 

asio::async_read_until(pThis->socket, pThis->buff, '\r', ...

好像它将以某种方式接收到一行一样.套接字不能那样工作.您会收到一个小包. TCP堆栈决定什么构成一个数据包. Asio只是承诺读取直到"数据包>包含<分隔符.它并没有说它不会收到更多，只是没有安排其他接收操作.

as if it will somehow receive exactly a single line. Sockets do not work that way. You'll receive a packet. The TCP stack(s) decide what constitutes a packet. Asio just promises to read "until" the packet >contains< the delimiter. It doesn't say it won't receive more, it just doesn't schedule another receive operation.

因此，要真正解决它，您可以简单地一次读取所有标头:

So, to really fix it, you might simply read all headers at once:

asio::async_read_until(pThis->socket, pThis->buff, "\r\n\r\n", 
    [pThis](const error_code &e, std::size_t s) {
        if (e) { std::cerr << "Error:" << __LINE__ << " " << e.message() << "\n"; return; }
        std::cout << __FILE__ << ":" << __LINE__ << " received:" << s << "\n";
        std::istream is(&pThis->buff);

        std::string line, ignore;

        if (getline(is, line, '\r') && is.ignore(1, '\n'))
            pThis->headers.on_read_request_line(line);

        while (getline(is, line, '\r') && is.ignore(1, '\n') && !line.empty())
            pThis->headers.on_read_header(line);

注意同样，重要的是不要假设报头结尾与数据包边界重合.因此，从耗尽已经收到的可用输入开始read_body():

NOTE Again, it's important not to assume that the end-of-headers coincides with the packet boundary. Therefore, start read_body() with draining the available input already received:

    std::shared_ptr<std::vector<char> > bufptr = std::make_shared<std::vector<char> >(nbuffer);

    auto partial = std::copy(
            std::istreambuf_iterator<char>(&pThis->buff), {}, 
            bufptr->begin());

    std::size_t already_received = std::distance(bufptr->begin(), partial);

    assert(nbuffer >= already_received);
    nbuffer -= already_received;

固定演示

在Coliru上直播 

#include <boost/asio.hpp>
#include <boost/algorithm/string/trim.hpp>
#include <string>
#include <memory>
#include <iostream>
#include <fstream>

using namespace boost;
using namespace boost::system;
using namespace boost::asio;

unsigned char *get_icon(int *pOutSize);

class session;

class http_headers {
    std::string method;
    std::string url;
    std::string version;

    std::map<std::string, std::string> headers;

public:
    std::string get_response() {
        std::stringstream ssOut;
        if (url == "/favicon.ico") {
            int nSize = 0;
            unsigned char *data = get_icon(&nSize);

            ssOut << "HTTP/1.1 200 OK" << std::endl;
            ssOut << "content-type: image/vnd.microsoft.icon" << std::endl;
            ssOut << "Content-Length: " << nSize << std::endl;
            ssOut << std::endl;

            ssOut.write((char *)data, nSize);
        } else if (url == "/") {
            std::string sHTML = "<html><body><h1>Hello World</h1><p>This is a test web server in c++</p></body></html>";
            ssOut << "HTTP/1.1 200 OK" << std::endl;
            ssOut << "Content-Type: text/html" << std::endl;
            ssOut << "Content-Length: " << sHTML.length() << std::endl;
            ssOut << std::endl;
            ssOut << sHTML;
        } else {
            std::string sHTML = "<html><body><h1>404 Not Found</h1><p>There's nothing here.</p></body></html>";
            ssOut << "HTTP/1.1 404 Not Found" << std::endl;
            ssOut << "Content-Type: text/html" << std::endl;
            ssOut << "Content-Length: " << sHTML.length() << std::endl;
            ssOut << std::endl;
            ssOut << sHTML;
        }
        return ssOut.str();
    }

    size_t content_length() {
        auto request = headers.find("Content-Length");
        if (request != headers.end()) {
            std::stringstream ssLength(request->second);
            size_t content_length;
            ssLength >> content_length;
            return content_length;
        }
        return 0;
    }

    void on_read_header(std::string line) {
        std::cout << "header: '" << line << "'\n";

        std::stringstream ssHeader(line);
        std::string headerName;
        std::getline(ssHeader, headerName, ':');

        std::string value;
        std::getline(ssHeader, value);
        headers[headerName] = value;
    }

    void on_read_request_line(std::string line) {
        std::stringstream ssRequestLine(line);
        ssRequestLine >> method;
        ssRequestLine >> url;
        ssRequestLine >> version;

        std::cout << "request for resource: " << url << std::endl;
    }
};

namespace {
    static void info(std::string s) { std::cout << "INFO:" << s << "\n"; }
}

class session {
    asio::streambuf buff;
    http_headers headers;

    static void read_body(std::shared_ptr<session> pThis) {

        info("read_body");

        size_t nbuffer = pThis->headers.content_length();
        std::cout << __FILE__ << ":" << __LINE__ << " nbuffer:" << nbuffer << "\n";

        std::shared_ptr<std::vector<char> > bufptr = std::make_shared<std::vector<char> >(nbuffer);

        auto partial = std::copy(
                std::istreambuf_iterator<char>(&pThis->buff), {}, 
                bufptr->begin());

        std::size_t already_received = std::distance(bufptr->begin(), partial);

        assert(nbuffer >= already_received);
        nbuffer -= already_received;

        asio::async_read(pThis->socket, boost::asio::buffer(&*bufptr->begin() + already_received, nbuffer),
            [=](const error_code &e, std::size_t s) {
                info("read body complete"); 
                // EOF is to be expected on client disconnect
                if (e && e != boost::asio::error::eof) { 
                    std::cerr << "Error:" << __LINE__ << " " << e.message() << "\n"; return; 
                }

                std::cout << __FILE__ << ":" << __LINE__ << " received:" << s << "/" << nbuffer << "\n";

                std::string body(&*bufptr->begin(), already_received + s);

                std::string::size_type p = 0;
                for (int i = 0; i<2; ++i)
                    p = body.find_last_of("\r\n", p-1);

                std::cout << "Tail: '" << body.substr(p+1) << "'\n";

                {
                    std::ofstream ofs("debug.txt", std::ios::binary);
                    ofs << body;
                    ofs << "\n" << __FILE__ << ":" << __LINE__ << " received:" << s << "/" << nbuffer << "\n";
                }
            });
    }

    static void read_headers(std::shared_ptr<session> pThis) {
        asio::async_read_until(pThis->socket, pThis->buff, "\r\n\r\n", 
            [pThis](const error_code &e, std::size_t s) {
                if (e) { std::cerr << "Error:" << __LINE__ << " " << e.message() << "\n"; return; }
                std::cout << __FILE__ << ":" << __LINE__ << " received:" << s << "\n";
                std::istream is(&pThis->buff);

                std::string line, ignore;

                if (getline(is, line, '\r') && is.ignore(1, '\n'))
                    pThis->headers.on_read_request_line(line);

                while (getline(is, line, '\r') && is.ignore(1, '\n') && !line.empty())
                    pThis->headers.on_read_header(line);

                if (pThis->headers.content_length()) {
                    pThis->read_body(pThis);

                    auto str = std::make_shared<std::string>("HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n");
                    asio::async_write(
                        pThis->socket, boost::asio::buffer(*str),
                        [pThis, str](const error_code &e, std::size_t s) {
                            std::cout << "done" << std::endl; 
                        });
                } else {
                    std::shared_ptr<std::string> str = std::make_shared<std::string>(pThis->headers.get_response());
                    asio::async_write(
                        pThis->socket, boost::asio::buffer(*str),
                        [pThis, str](const error_code &e, std::size_t s) {
                            std::cout << "done" << std::endl; 
                        });
                }
            });
    }

public:
    ip::tcp::socket socket;

    session(io_service &io_service) : socket(io_service) {}

    static void interact(std::shared_ptr<session> pThis) { read_headers(pThis); }
};

void accept_and_run(ip::tcp::acceptor &acceptor, io_service &io_service) {
    std::shared_ptr<session> sesh = std::make_shared<session>(io_service);
    acceptor.async_accept(sesh->socket, [sesh, &acceptor, &io_service](const error_code &accept_error) {
        accept_and_run(acceptor, io_service);
        if (accept_error) {
            std::cerr << "Accept error: " << accept_error.message() << "\n";
        } else {
            session::interact(sesh);
        }
    });
}

int main() {
    io_service io_service;
    ip::tcp::endpoint endpoint{ ip::tcp::v4(), 8181 };
    ip::tcp::acceptor acceptor{ io_service, endpoint };

    acceptor.listen();
    accept_and_run(acceptor, io_service);

    io_service.run();
}

unsigned char icon_data[] = {
    // reserved
    0x00, 0x00,
    // icon type (1 = icon)
    0x01, 0x00,
    // number of images (1)
    0x01, 0x00,
    // width, height (16x16)
    0x10, 0x10,
    // size of colour palette
    0x00,
    // reserved
    0x00,
    // colour planes (1)
    0x01, 0x00,
    // bits per pixel (32)
    0x20, 0x00,

    // size of data in bytes
    0x28, 0x04, 0x00, 0x00,

    // offset of bitmap data
    0x16, 0x00, 0x00, 0x00,

    // BEGIN BITMAPINFOHEADER
    // bcsize
    0x28, 0x00, 0x00, 0x00, // biSize
    0x10, 0x00, 0x00, 0x00, // biWidth
    0x20, 0x00, 0x00, 0x00, // biHeight (with both AND and XOR mask? wtf?)

    0x01, 0x00, // biPlanes
    0x20, 0x00, // biBitCount (32)

    0x00, 0x00, 0x00, 0x00, // biCompression
    0x00, 0x00, 0x00, 0x00, // biSizeImage
    0x00, 0x00, 0x00, 0x00, // biXPelsPerMeter
    0x00, 0x00, 0x00, 0x00, // biYPelsPerMeter
    0x00, 0x00, 0x00, 0x00, // biClrUsed
    0x00, 0x00, 0x00, 0x00, // biClrImportant
    // END BITMAPINFOHEADER

    // BITMAP DATA (4 bytes per pixel)
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
    0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
    0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
    0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
    0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
    0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF,
    0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0xFF, 0x00, 0xFF,

    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
    0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF
};

unsigned char *get_icon(int *pOut) {
    *pOut = sizeof(icon_data);
    return icon_data;
}
上一篇 : ：无法使用代理下载URL下一篇 : 基于内容的RxJava可观察缓冲区

相关阅读

技术问答最新文章

网站首页网站地图Copyright © 2021-2022 且购网

免责声明：本站文章部分来源于互联网,如有侵权请联系站长,我们将在72小时内删除。