sending json using post request

example/simple_get.f90 → example/get.f90

@@ -1,4 +1,4 @@
-program simple_get
+program get_request
     ! This program demonstrates sending a simple GET request and printing the
     ! status, length of the body, method, and the body of the response.
     use http, only: response_type, request
@@ -15,4 +15,4 @@ program simple_get
         print *, 'Response Content : ', response%content
     end if
 
-end program simple_get
+end program get_request

example/post.f90

@@ -0,0 +1,23 @@
+program post_request
+    ! This program demonstrates sending JSON data using POST request and printing the
+    ! status, length of the body, method, and the body of the response.
+    use http, only: response_type, request, HTTP_POST
+    implicit none
+    type(response_type) :: response
+    character(:), allocatable :: json_data
+
+    ! JSON data we want to send
+    json_data = '{"name":"Jhon","role":"developer"}'
+
+    response = request(url='https://httpbin.org/post', method=HTTP_POST, json=json_data)
+
+    if(.not. response%ok) then
+        print *,'Error message : ', response%err_msg
+    else
+        print *, 'Response Code    : ', response%status_code
+        print *, 'Response Length  : ', response%content_length
+        print *, 'Response Method  : ', response%method
+        print *, 'Response Content : ', response%content
+    end if
+
+end program post_request

example/response_header.f90

@@ -17,11 +17,13 @@ program response_header
       header_type('User-Agent', 'my user agent') &
       ]
 
-    response = request(url='https://reqres.in/api/users/1', header=req_header)
+    response = request(url='https://httpbin.org/get', header=req_header)
 
     if (.not. response%ok) then
         print *,'Error message : ', response%err_msg
     else
+        print*, '::::::::::::::::: Request send by us :::::::::::::::::'
+        print *, response%content
         print*, '::::::::::::::::: Fetching all response header :::::::::::::::::'
         header = response%header
         ! Iterate over response headers.

src/http/http_client.f90

@@ -6,7 +6,8 @@ module http_client
         curl_easy_strerror, curl_slist_append, CURLE_OK, &
         CURLINFO_RESPONSE_CODE, CURLOPT_CUSTOMREQUEST, CURLOPT_HEADERDATA, &
         CURLOPT_HEADERFUNCTION, CURLOPT_HTTPHEADER, CURLOPT_URL, &
-        CURLOPT_WRITEDATA, CURLOPT_WRITEFUNCTION
+        CURLOPT_WRITEDATA, CURLOPT_WRITEFUNCTION, &
+        CURLOPT_POSTFIELDS, CURLOPT_POSTFIELDSIZE_LARGE
     use stdlib_optval, only: optval
     use http_request, only: request_type
     use http_response, only: response_type
@@ -34,14 +35,18 @@ module http_client
 
 contains
     ! Constructor for request_type type.
-    function new_request(url, method, header) result(response)
-        character(len=*), intent(in) :: url
+    function new_request(url, method, header, json) result(response)
         integer, intent(in), optional :: method
+        character(len=*), intent(in) :: url
+        character(len=*), intent(in), optional :: json
         type(header_type), intent(in), optional :: header(:)
         type(request_type) :: request
         type(response_type) :: response
         type(client_type) :: client
 
+        ! setting request url
+        request%url = url
+
         ! Set default HTTP method.
         request%method = optval(method, 1)
 
@@ -50,9 +55,11 @@ function new_request(url, method, header) result(response)
         if(present(header)) then 
             request%header = [header, request%header]
         end if
-
-        ! setting request url
-        request%url = url
+
+        if(present(json)) then
+            request%json = json
+            request%header = [request%header, header_type('Content-Type', 'application/json')]
+        end if
 
         client = client_type(request=request)
 
@@ -96,7 +103,10 @@ & function failed. This can occur due to insufficient memory available in the sy
         rc = curl_easy_setopt(curl_ptr, CURLOPT_URL, this%request%url // c_null_char)
 
         ! setting request method
-        rc = client_set_method(curl_ptr, this%request%method, response)
+        rc = set_method(curl_ptr, this%request%method, response)
+
+        ! setting request body
+        rc = set_body(curl_ptr, this%request%json)
 
         ! setting request header
         rc = curl_easy_setopt(curl_ptr, CURLOPT_HTTPHEADER, header_list_ptr);
@@ -142,7 +152,7 @@ subroutine prepare_request_header_ptr(header_list_ptr, req_headers)
         end do
     end subroutine prepare_request_header_ptr
 
-    function client_set_method(curl_ptr, method, response) result(status)
+    function set_method(curl_ptr, method, response) result(status)
         type(c_ptr), intent(out) :: curl_ptr
         integer, intent(in) :: method
         type(response_type), intent(out) :: response
@@ -170,7 +180,18 @@ function client_set_method(curl_ptr, method, response) result(status)
         case default
             error stop 'Method argument can be either HTTP_GET, HTTP_HEAD, HTTP_POST, HTTP_PUT, HTTP_DELETE, HTTP_PATCH'
         end select
-    end function client_set_method
+    end function set_method
+
+    function set_body(curl_ptr, json) result(status)
+        type(c_ptr), intent(out) :: curl_ptr
+        character(*), intent(in) :: json
+        integer :: status, json_length
+        json_length = len(json)
+        ! if(json_length > 0) then
+            status = curl_easy_setopt(curl_ptr, CURLOPT_POSTFIELDS, json)
+            status = curl_easy_setopt(curl_ptr, CURLOPT_POSTFIELDSIZE_LARGE, json_length)
+        ! end if
+    end function set_body
 
     function client_response_callback(ptr, size, nmemb, client_data) bind(c)
         type(c_ptr), intent(in), value :: ptr 

src/http/http_request.f90

@@ -16,7 +16,7 @@ module http_request
 
     ! Request Type
     type :: request_type
-        character(len=:), allocatable :: url
+        character(len=:), allocatable :: url, json
         integer :: method
         type(header_type), allocatable :: header(:)
     end type request_type