How do you make a HTTP request with C

Question

Is there any way to easily make a HTTP request with C     Specifically  I want to download the contents of a page  an API  and check the contents to see if it contains a 1 or a 0  Is it also possible to download the contents into a string

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Note that this does not require libcurl  Windows h  or WinSock  No compilation of libraries  no project configuration  etc  I have this code working in Visual Studio 2017 c   on Windows 10    pragma comment lib   urlmon lib     include  lt urlmon h gt   include  lt sstream gt   using namespace std        IStream  stream    Also works with https URL s - unsure about the extent of SSL support though  HRESULT result   URLOpenBlockingStream 0   http   google com    amp stream  0  0   if  result    0        return 1    char buffer 100   unsigned long bytesRead  stringstream ss  stream- gt Read buffer  100   amp bytesRead   while  bytesRead  gt  0U        ss write buffer   long long bytesRead       stream- gt Read buffer  100   amp bytesRead     stream Release    string resultString   ss str      I just figured out how to do this  as I wanted a simple API access script  libraries like libcurl were causing me all kinds of problems  even when I followed the directions      and WinSock is just too low-level and complicated   I m not quite sure about all of the IStream reading code  particularly the while condition - feel free to correct improve   but hey  it works  hassle free   It makes sense to me that  since I used a blocking  synchronous  call  this is fine  that bytesRead would always be   0U until the stream  ISequentialStream   is finished being read  but who knows    See also  URL Monikers and Asynchronous Pluggable Protocol Reference

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CppRest SDK by MS is what I just found and after about 1 2 hour had my first simple web service call working   Compared that to others mentioned here where I was not able to get anything even installed after hours of looking  I d say it is pretty impressive https   github com microsoft cpprestsdk Scroll down and click on Documentation  then click on Getting Started Tutorial and you will have a simple app running in no time

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C and C   don t have a standard library for HTTP or even for socket connections  Over the years some portable libraries have been developed  The most widely used  as others have said  is libcurl   Here is a list of alternatives to libcurl  coming from the libcurl s web site    Also  for Linux  this is a simple HTTP client  You could implement your own simple HTTP GET client  but this won t work if there are authentication or redirects involved or if you need to work behind a proxy  For these cases you need a full-blown library like libcurl   For source code with libcurl  this is the closest to what you want  Libcurl has many examples   Look at the main function  The html content will be copied to the buffer  after a successfully connection  Just replace parseHtml with your own function

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Generally I d recommend something cross-platform like cURL  POCO  or Qt  However  here is a Windows example         include  lt atlbase h gt   include  lt msxml6 h gt   include  lt comutil h gt      bstr t  HRESULT hr  CComPtr lt IXMLHTTPRequest gt  request   hr   request CoCreateInstance CLSID XMLHTTP60   hr   request- gt open       bstr t  GET         bstr t  https   www google com images srpr logo11w png         variant t VARIANT FALSE        variant t         variant t     hr   request- gt send  variant t         get status - 200 if succuss long status  hr   request- gt get status  amp status       load image data  if url points to an image  VARIANT responseVariant  hr   request- gt get responseStream  amp responseVariant   IStream  stream    IStream  responseVariant punkVal  CImage  image   new CImage    image- gt Load stream   stream- gt Release

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There is a newer  less mature curl wrapper being developed called C   Requests  Here s a simple GET request    include  lt iostream gt   include  lt cpr h gt   int main int argc  char   argv        auto response   cpr  Get cpr  Url  http   httpbin org get         std  cout  lt  lt  response text  lt  lt  std  endl      It supports a wide variety of HTTP verbs and curl options  There s more usage documentation here   Disclaimer  I m the maintainer of this library

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Here is some code that will work with no need to use any 3rd party library  First define your gateway  user  password and any other parameters you need to send to this specific server    define USERNAME  user   define PASSWORD  your password   define GATEWAY  your gateway    Here is the code itself   HINTERNET hOpenHandle  hResourceHandle  hConnectHandle  const TCHAR  szHeaders    T  Content-Type application json  charset utf-8 r n      hOpenHandle   InternetOpen  T  HTTPS    INTERNET OPEN TYPE DIRECT  NULL  NULL  0   if  hOpenHandle    NULL        return false      hConnectHandle   InternetConnect hOpenHandle      GATEWAY      INTERNET DEFAULT HTTPS PORT      NULL  NULL  INTERNET SERVICE HTTP      0  1    if  hConnectHandle    NULL        InternetCloseHandle hOpenHandle       return false      hResourceHandle   HttpOpenRequest hConnectHandle       T  POST        GATEWAY      NULL  NULL  NULL  INTERNET FLAG SECURE   INTERNET FLAG KEEP CONNECTION      1    if  hResourceHandle    NULL        InternetCloseHandle hOpenHandle       InternetCloseHandle hConnectHandle       return false     InternetSetOption hResourceHandle  INTERNET OPTION USERNAME   LPVOID USERNAME   tcslen USERNAME    InternetSetOption hResourceHandle  INTERNET OPTION PASSWORD   LPVOID PASSWORD   tcslen PASSWORD     std  string buf  if  HttpSendRequest hResourceHandle  szHeaders  0  NULL  0         while  true                std  string part          DWORD size          if   InternetQueryDataAvailable hResourceHandle   amp size  0  0  break          if  size    0 break          part resize size           if   InternetReadFile hResourceHandle   amp part 0   part size     amp size  break          if  size    0 break          part resize size           buf append part            if   buf empty             Get data back    InternetCloseHandle hResourceHandle   InternetCloseHandle hConnectHandle   InternetCloseHandle hOpenHandle     That should work on a Win32 API environment   Here is an example

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You may want to check C   REST SDK  codename  Casablanca    http   msdn microsoft com en-us library jj950081 aspx  With the C   REST SDK  you can more easily connect to HTTP servers from your C   app   Usage example    include  lt iostream gt   include  lt cpprest http client h gt   using namespace web  http                      Common HTTP functionality using namespace web  http  client              HTTP client features  int main int argc  char   argv        http client client  http   httpbin org          http response response         ordinary  get  request     response   client request methods  GET    get   get        std  cout  lt  lt  response extract string   get    lt  lt    n           working with json     response   client request methods  GET    get   get        std  cout  lt  lt   url     lt  lt  response extract json   get   U  url     lt  lt    n       The C   REST SDK is a Microsoft project for cloud-based client-server communication in native code using a modern asynchronous C   API design

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You can use embeddedRest library  It is lightweight header-only library  So it is easy to include it to your project and it does not require compilation cause there no  cpp files in it  Request example from readme md from repo   include  quot UrlRequest hpp quot          UrlRequest request  request host  quot api vk com quot    const auto countryId   1  const auto count   1000  request uri  quot  method database getCities quot           quot lang quot    quot ru quot            quot country id quot   countryId           quot count quot   count           quot need all quot    quot 1 quot         request addHeader  quot Content-Type  application json quot    auto response   std  move request perform     if  response statusCode      200      cout  lt  lt   quot status code    quot   lt  lt  response statusCode    lt  lt   quot   body     quot   lt  lt  response body    lt  lt   quot   quot   lt  lt  endl   else    cout  lt  lt   quot status code    quot   lt  lt  response statusCode    lt  lt   quot   description    quot   lt  lt  response statusDescription    lt  lt  endl

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Windows code    include  lt string h gt   include  lt winsock2 h gt   include  lt windows h gt   include  lt iostream gt   include  lt vector gt   include  lt locale gt   include  lt sstream gt  using namespace std   pragma comment lib  ws2 32 lib       int main  void     WSADATA wsaData  SOCKET Socket  SOCKADDR IN SockAddr  int lineCount 0  int rowCount 0  struct hostent  host  locale local  char buffer 10000   int i   0   int nDataLength  string website HTML      website url string url    www google com      HTTP GET string get http    GET   HTTP 1 1 r nHost      url     r nConnection  close r n r n         if  WSAStartup MAKEWORD 2 2    amp wsaData     0           cout  lt  lt   WSAStartup failed  n           system  pause              return 1             Socket socket AF INET SOCK STREAM IPPROTO TCP       host   gethostbyname url c str          SockAddr sin port htons 80       SockAddr sin family AF INET      SockAddr sin addr s addr      unsigned long  host- gt h addr        if connect Socket  SOCKADDR    amp SockAddr  sizeof SockAddr      0           cout  lt  lt   Could not connect           system  pause              return 1                send GET   HTTP     send Socket get http c str    strlen get http c str    0            recieve html     while   nDataLength   recv Socket buffer 10000 0    gt  0                   int i   0          while  buffer i   gt   32    buffer i       n     buffer i       r                 website HTML  buffer i               i    1                                      closesocket Socket       WSACleanup            Display HTML source      cout lt  lt website HTML          pause     cout lt  lt   n nPress ANY key to close  n n       cin ignore    cin get        return 0      Here is a much better implementation     include  lt windows h gt   include  lt string gt   include  lt stdio h gt   using std  string    pragma comment lib  ws2 32 lib     HINSTANCE hInst  WSADATA wsaData  void mParseUrl char  mUrl  string  amp serverName  string  amp filepath  string  amp filename   SOCKET connectToServer char  szServerName  WORD portNum   int getHeaderLength char  content   char  readUrl2 char  szUrl  long  amp bytesReturnedOut  char   headerOut     int main         const int bufLen   1024      char  szUrl    http   stackoverflow com       long fileSize      char  memBuffer   headerBuffer      FILE  fp       memBuffer   headerBuffer   NULL       if   WSAStartup 0x101   amp wsaData     0          return -1        memBuffer   readUrl2 szUrl  fileSize   amp headerBuffer       printf  returned from readUrl n        printf  data returned  n s   memBuffer       if  fileSize    0                printf  Got some data n            fp   fopen  downloaded file    wb            fwrite memBuffer  1  fileSize  fp           fclose fp            delete memBuffer           delete headerBuffer              WSACleanup        return 0      void mParseUrl char  mUrl  string  amp serverName  string  amp filepath  string  amp filename        string  size type n      string url   mUrl       if  url substr 0 7      http              url erase 0 7        if  url substr 0 8      https              url erase 0 8        n   url find           if  n    string  npos                serverName   url substr 0 n           filepath   url substr n           n   filepath rfind               filename   filepath substr n 1              else               serverName   url          filepath                filename                SOCKET connectToServer char  szServerName  WORD portNum        struct hostent  hp      unsigned int addr      struct sockaddr in server      SOCKET conn       conn   socket AF INET  SOCK STREAM  IPPROTO TCP       if  conn    INVALID SOCKET          return NULL       if inet addr szServerName   INADDR NONE                hp gethostbyname szServerName             else               addr inet addr szServerName           hp gethostbyaddr  char   amp addr sizeof addr  AF INET              if hp  NULL                closesocket conn           return NULL             server sin addr s addr    unsigned long  hp- gt h addr       server sin family AF INET      server sin port htons portNum       if connect conn  struct sockaddr   amp server sizeof server                  closesocket conn           return NULL            return conn     int getHeaderLength char  content        const char  srchStr1     r n r n    srchStr2     n r n r       char  findPos      int ofset   -1       findPos   strstr content  srchStr1       if  findPos    NULL                ofset   findPos - content          ofset    strlen srchStr1              else               findPos   strstr content  srchStr2           if  findPos    NULL                        ofset   findPos - content              ofset    strlen srchStr2                       return ofset     char  readUrl2 char  szUrl  long  amp bytesReturnedOut  char   headerOut        const int bufSize   512      char readBuffer bufSize   sendBuffer bufSize   tmpBuffer bufSize       char  tmpResult NULL   result      SOCKET conn      string server  filepath  filename      long totalBytesRead  thisReadSize  headerLen       mParseUrl szUrl  server  filepath  filename                      step 1  connect                            conn   connectToServer  char  server c str    80                      step 2  send GET request                   sprintf tmpBuffer   GET  s HTTP 1 0   filepath c str         strcpy sendBuffer  tmpBuffer       strcat sendBuffer    r n        sprintf tmpBuffer   Host   s   server c str         strcat sendBuffer  tmpBuffer       strcat sendBuffer    r n        strcat sendBuffer    r n        send conn  sendBuffer  strlen sendBuffer   0          SetWindowText edit3Hwnd  sendBuffer       printf  Buffer being sent  n s   sendBuffer                      step 3 - get received bytes                         Receive until the peer closes the connection     totalBytesRead   0      while 1                memset readBuffer  0  bufSize           thisReadSize   recv  conn  readBuffer  bufSize  0            if   thisReadSize  lt   0               break           tmpResult    char  realloc tmpResult  thisReadSize totalBytesRead            memcpy tmpResult totalBytesRead  readBuffer  thisReadSize           totalBytesRead    thisReadSize             headerLen   getHeaderLength tmpResult       long contenLen   totalBytesRead-headerLen      result   new char contenLen 1       memcpy result  tmpResult headerLen  contenLen       result contenLen    0x0      char  myTmp       myTmp   new char headerLen 1       strncpy myTmp  tmpResult  headerLen       myTmp headerLen    NULL      delete tmpResult        headerOut   myTmp       bytesReturnedOut   contenLen      closesocket conn       return result

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Updated answer for April  2020   I ve had a lot of success  recently  with cpp-httplib  both as a client and a server   It s mature and its approximate  single-threaded RPS is around 6k   On more of the bleeding edge  there s a really promising framework  cpv-framework  that can get around 180k RPS on two cores  and will scale well with the number of cores because it s based on the seastar framework  which powers the fastest DBs on the planet  scylladb     However  cpv-framework is still relatively immature  so  for most uses  I highly recommend cpp-httplib   This recommendation replaces my previous answer  8 years ago

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If you are looking for a HTTP client library in C   that is supported in multiple platforms  Linux  Windows and Mac  for consuming Restful web services  You can have below options    QT Network Library - Allows the application to send network requests and receive replies C   REST SDK - An emerging third-party HTTP library with PPL support Libcurl - It is probably one of the most used http lib in the native world

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You can use ACE in order to do so    include  ace SOCK Connector h   int main int argc  ACE TCHAR  argv            HTTP Request Header     char  szRequest    GET  video nice mp4 HTTP 1 1 r nHost  example com r n r n        int ilen   strlen szRequest          our buffer     char output 16 1024        ACE INET Addr server  80   example com        ACE SOCK Stream peer      ACE SOCK Connector connector      int ires   connector connect peer  server       int sum   0      peer send szRequest  ilen       while  true                ACE Time Value timeout   ACE Time Value 15           int rc   peer recv n output  16 1024   amp timeout           if  rc    -1                        break                    sum    rc            peer close        printf  Bytes transffered   d  sum        return 0

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Update 2020  I have a new answer that replaces this  now 8-years-old  one  https   stackoverflow com a 61177330 278976  On Linux  I tried cpp-netlib  libcurl  curlpp  urdl  boost  asio and considered Qt  but turned it down based on the license   All of these were either incomplete for this use  had sloppy interfaces  had poor documentation  were unmaintained or didn t support https   Then  at the suggestion of https   stackoverflow com a 1012577 278976  I tried POCO  Wow  I wish I had seen this years ago  Here s an example of making an HTTP GET request with POCO   https   stackoverflow com a 26026828 2817595  POCO is free  open source  boost license   And no  I don t have any affiliation with the company  I just really like their interfaces  Great job guys  and gals    https   pocoproject org download html  Hope this helps someone    it took me three days to try all of these libraries out

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libCURL is a pretty good option for you  Depending on what you need to do  the tutorial should tell you what you want  specifically for the easy handle  But  basically  you could do this just to see the source of a page   CURL  c  c   curl easy init    curl easy setopt  c  CURL URL   www google com     curl easy perform  c    curl easy cleanup  c      I believe this will cause the result to be printed to stdout  If you want to handle it instead -- which  I assume  you do -- you need to set the CURL WRITEFUNCTION  All of that is covered in the curl tutorial linked above

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C   does not provide any way to do it directly  It would entirely depend on what platforms and libraries that you have   At worst case  you can use the boost  asio library to establish a TCP connection  send the HTTP headers  RFC 2616   and parse the responses directly  Looking at your application needs  this is simple enough to do

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The HTTP protocol is very simple  so it is very simple to write a HTTP client  Here is one https   github com pedro-vicente lib netsockets It uses HTTP GET to retrieve a file from a web server  both server and file are command line parameters  The remote file is saved to a local copy  Disclaimer  I am the author check http cc https   github com pedro-vicente lib netsockets blob master src http cc int http client t  get const char  path remote file      char buf request 1024        construct request message using class input parameters   sprintf buf request   quot GET  s HTTP 1 1 r nHost   s r nConnection  close r n r n quot   path remote file  m server ip c str          send request  using built in tcp client t socket   if  this- gt write all buf request   int strlen buf request    lt  0          return -1       EDIT  edited URL

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Here is some  relatively  simple C  11 code that uses libCURL to download a URL s content into a std  vector lt char gt   http download hh   pragma once   include  lt string gt   include  lt vector gt   std  vector lt char gt  download std  string url  long  responseCode   nullptr    http download cc  include  quot http download hh quot    include  lt curl curl h gt   include  lt sstream gt   include  lt stdexcept gt   using namespace std   size t callback void  contents  size t size  size t nmemb  void  user      auto chunk   reinterpret cast lt char  gt  contents     auto buffer   reinterpret cast lt vector lt char gt   gt  user      size t priorSize   buffer- gt size      size t sizeIncrease   size   nmemb     buffer- gt resize priorSize   sizeIncrease     std  copy chunk  chunk   sizeIncrease  buffer- gt data     priorSize      return sizeIncrease     vector lt char gt  download string url  long  responseCode      vector lt char gt  data     curl global init CURL GLOBAL ALL     CURL  handle   curl easy init      curl easy setopt handle  CURLOPT URL  url c str       curl easy setopt handle  CURLOPT WRITEFUNCTION  callback     curl easy setopt handle  CURLOPT WRITEDATA   amp data     curl easy setopt handle  CURLOPT USERAGENT   quot libcurl-agent 1 0 quot      CURLcode result   curl easy perform handle     if  responseCode    nullptr      curl easy getinfo handle  CURLINFO RESPONSE CODE  responseCode     curl easy cleanup handle     curl global cleanup       if  result    CURLE OK          stringstream err      err  lt  lt   quot Error downloading from URL   quot  quot   lt  lt  url  lt  lt   quot   quot    quot   lt  lt  curl easy strerror result       throw runtime error err str            return data

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With this answer I refer to the answer from Software Developer  By rebuilding the code I found that some parts are deprecated  gethostbyname    or do not provide error handling  creation of sockets  sending something  for an operation   The following windows code is tested with Visual Studio 2013 and Windows 8 1 64-bit as well as Windows 7 64-bit  It will target an IPv4 TCP Connection with the Web Server of www google com    include  lt winsock2 h gt   include  lt WS2tcpip h gt   include  lt windows h gt   include  lt iostream gt   pragma comment lib  ws2 32 lib   using namespace std      int main            Initialize Dependencies to the Windows Socket      WSADATA wsaData      if  WSAStartup MAKEWORD 2 2    amp wsaData     0            cout  lt  lt   WSAStartup failed  n           system  pause            return -1                We first prepare some  hints  for the  getaddrinfo  function        to tell it  that we are looking for a IPv4 TCP Connection      struct addrinfo hints      ZeroMemory  amp hints  sizeof hints        hints ai family   AF INET              We are targeting IPv4     hints ai protocol   IPPROTO TCP        We are targeting TCP     hints ai socktype   SOCK STREAM        We are targeting TCP so its SOCK STREAM         Aquiring of the IPv4 address of a host using the newer         getaddrinfo  function which outdated  gethostbyname          It will search for IPv4 addresses using the TCP-Protocol      struct addrinfo  targetAdressInfo   NULL      DWORD getAddrRes   getaddrinfo  www google com   NULL   amp hints   amp targetAdressInfo       if  getAddrRes    0    targetAdressInfo    NULL                cout  lt  lt   Could not resolve the Host Name   lt  lt  endl          system  pause            WSACleanup            return -1                Create the Socket Address Informations  using IPv4        We dont have to take care of sin zero  it is only used to extend the length of SOCKADDR IN to the size of SOCKADDR     SOCKADDR IN sockAddr      sockAddr sin addr     struct sockaddr in   targetAdressInfo- gt ai addr - gt sin addr        The IPv4 Address from the Address Resolution Result     sockAddr sin family   AF INET      IPv4     sockAddr sin port   htons 80       HTTP Port  80         We have to free the Address-Information from getaddrinfo again     freeaddrinfo targetAdressInfo           Creation of a socket for the communication with the Web Server         using IPv4 and the TCP-Protocol     SOCKET webSocket   socket AF INET  SOCK STREAM  IPPROTO TCP       if  webSocket    INVALID SOCKET                cout  lt  lt   Creation of the Socket Failed   lt  lt  endl          system  pause            WSACleanup            return -1                Establishing a connection to the web Socket     cout  lt  lt   Connecting    n       if connect webSocket   SOCKADDR   amp sockAddr  sizeof sockAddr      0                cout  lt  lt   Could not connect           system  pause            closesocket webSocket           WSACleanup            return -1            cout  lt  lt   Connected  n           Sending a HTTP-GET-Request to the Web Server     const char  httpRequest    GET   HTTP 1 1 r nHost  www google com r nConnection  close r n r n       int sentBytes   send webSocket  httpRequest  strlen httpRequest  0       if  sentBytes  lt  strlen httpRequest     sentBytes    SOCKET ERROR                cout  lt  lt   Could not send the request to the Server   lt  lt  endl          system  pause            closesocket webSocket           WSACleanup            return -1                Receiving and Displaying an answer from the Web Server     char buffer 10000       ZeroMemory buffer  sizeof buffer        int dataLen      while   dataLen   recv webSocket  buffer  sizeof buffer   0   gt  0                 int i   0          while  buffer i   gt   32    buffer i       n     buffer i       r                 cout  lt  lt  buffer i               i    1                          Cleaning up Windows Socket Dependencies     closesocket webSocket       WSACleanup         system  pause        return 0      References   Deprecation of gethostbyname  Return Value of socket    Return Value of send

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Here is my minimal wrapper around cURL to be able just to fetch a webpage as a string  This is useful  for example  for unit testing   It is basically a RAII wrapper around the C code   Install  libcurl  on your machine yum install libcurl libcurl-devel or equivalent   Usage example   CURLplusplus client  string x   client Get  http   google com    string y   client Get  http   yahoo com      Class implementation    include  lt curl curl h gt    class CURLplusplus   private      CURL  curl      stringstream ss      long http code  public      CURLplusplus                 curl curl easy init          http code 0                    CURLplusplus                 if  curl  curl easy cleanup curl             std  string Get const std  string amp  url                CURLcode res          curl easy setopt curl  CURLOPT URL  url c str             curl easy setopt curl  CURLOPT FOLLOWLOCATION  1L           curl easy setopt curl  CURLOPT WRITEFUNCTION  write data           curl easy setopt curl  CURLOPT WRITEDATA  this            ss str              http code   0          res   curl easy perform curl           if  res    CURLE OK                        throw std  runtime error curl easy strerror res                      curl easy getinfo curl  CURLINFO RESPONSE CODE   amp http code           return ss str              long GetHttpCode                 return http code        private      static size t write data void  buffer  size t size  size t nmemb  void  userp                return static cast lt CURLplusplus  gt  userp - gt Write buffer size nmemb             size t Write void  buffer  size t size  size t nmemb                ss write  const char  buffer size nmemb           return size nmemb

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As you want a C   solution  you could use Qt  It has a QHttp class you can use   You can check the docs   http- gt setHost  qt nokia com    http- gt get QUrl  toPercentEncoding   index html       Qt also has a lot more to it that you could use in a common C   app

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I had the same problem  libcurl is really complete  There is a C   wrapper curlpp that might interest you as you ask for a C   library  neon is another interesting C library that also support WebDAV  curlpp seems natural if you use C    There are many examples provided in the source distribution  To get the content of an URL you do something like that  extracted from examples       Edit   rewritten for cURLpp 0 7 3    Note   namespace changed  was cURLpp in 0 7 2       include  lt curlpp cURLpp hpp gt   include  lt curlpp Options hpp gt      RAII cleanup  curlpp  Cleanup myCleanup      Send request and get a result     Here I use a shortcut to get it in a string stream      std  ostringstream os  os  lt  lt  curlpp  options  Url std  string  quot http   www wikipedia org quot      string asAskedInQuestion   os str     See the examples directory in curlpp source distribution  there is a lot of more complex cases  as well as a simple complete minimal one using curlpp  my 2 cents

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Although a little bit late  You may prefer https   github com Taymindis backcurl    It allows you to do http call on mobile c   development  Suitable for Mobile game developement  bcl  init       init when using  bcl  execute lt std  string gt    amp   bcl  Request  req        bcl  setOpts req  CURLOPT URL    http   www google com                CURLOPT FOLLOWLOCATION  1L               CURLOPT WRITEFUNCTION   amp bcl  writeContentCallback               CURLOPT WRITEDATA  req- gt dataPtr               CURLOPT USERAGENT   libcurl-agent 1 0                CURLOPT RANGE   0-200000                      amp   bcl  Response   resp        std  string ret    std  string resp- gt getBody lt std  string gt   - gt c str         printf  Sync      s n   ret c str           bcl  cleanUp       clean up when no more using

[c++] How do you make a HTTP request with C++?

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