Same as IO.
Same as IO.
Returns true if stat is writable by the effective user id of this process.
File.stat("testfile").writable? #=> true
Returns true if the operating system supports pipes and stat is a pipe; false otherwise.
Returns true if stat has its sticky bit set, false if it doesn’t or if the operating system doesn’t support this feature.
File.stat("testfile").sticky? #=> false
Transfers ownership of the underlying memory to a new buffer, causing the current buffer to become uninitialized.
buffer = IO::Buffer.new('test') other = buffer.transfer other # => # #<IO::Buffer 0x00007f136a15f7b0+4 SLICE> # 0x00000000 74 65 73 74 test buffer # => # #<IO::Buffer 0x0000000000000000+0 NULL> buffer.null? # => true
If the buffer is private, meaning modifications to the buffer will not be replicated to the underlying file mapping.
# Create a test file: File.write('test.txt', 'test') # Create a private mapping from the given file. Note that the file here # is opened in read-only mode, but it doesn't matter due to the private # mapping: buffer = IO::Buffer.map(File.open('test.txt'), nil, 0, IO::Buffer::PRIVATE) # => #<IO::Buffer 0x00007fce63f11000+4 MAPPED PRIVATE> # Write to the buffer (invoking CoW of the underlying file buffer): buffer.set_string('b', 0) # => 1 # The file itself is not modified: File.read('test.txt') # => "test"
Write at least length bytes from the buffer starting at offset, into the io. If an error occurs, return -errno.
If length is not given or nil, it defaults to the size of the buffer minus the offset, i.e. the entire buffer.
If length is zero, exactly one write operation will occur.
If offset is not given, it defaults to zero, i.e. the beginning of the buffer.
out = File.open('output.txt', 'wb') IO::Buffer.for('1234567').write(out, 3)
This leads to 123 being written into output.txt
Write at least length bytes from the buffer starting at offset, into the io starting at the specified from position. If an error occurs, return -errno.
If length is not given or nil, it defaults to the size of the buffer minus the offset, i.e. the entire buffer.
If length is zero, exactly one pwrite operation will occur.
If offset is not given, it defaults to zero, i.e. the beginning of the buffer.
If the from position is beyond the end of the file, the gap will be filled with null (0 value) bytes.
out = File.open('output.txt', File::RDWR) # open for read/write, no truncation IO::Buffer.for('1234567').pwrite(out, 2, 3, 1)
This leads to 234 (3 bytes, starting from position 1) being written into output.txt, starting from file position 2.
Posts data to a host; returns a Net::HTTPResponse object.
Argument url must be a URL; argument data must be a string:
_uri = uri.dup _uri.path = '/posts' data = '{"title": "foo", "body": "bar", "userId": 1}' headers = {'content-type': 'application/json'} res = Net::HTTP.post(_uri, data, headers) # => #<Net::HTTPCreated 201 Created readbody=true> puts res.body
Output:
{
"title": "foo",
"body": "bar",
"userId": 1,
"id": 101
}
Related:
Net::HTTP::Post: request class for HTTP method POST.
Net::HTTP#post: convenience method for HTTP method POST.
Creates a new Net::HTTP object, http, via Net::HTTP.new:
For arguments address and port, see Net::HTTP.new.
For proxy-defining arguments p_addr through p_pass, see Proxy Server.
For argument opts, see below.
With no block given:
Calls http.start with no block (see start), which opens a TCP connection and HTTP session.
Returns http.
The caller should call finish to close the session:
http = Net::HTTP.start(hostname) http.started? # => true http.finish http.started? # => false
With a block given:
Calls http.start with the block (see start), which:
Opens a TCP connection and HTTP session.
Calls the block, which may make any number of requests to the host.
Closes the HTTP session and TCP connection on block exit.
Returns the block’s value object.
Returns object.
Example:
hostname = 'jsonplaceholder.typicode.com' Net::HTTP.start(hostname) do |http| puts http.get('/todos/1').body puts http.get('/todos/2').body end
Output:
{
"userId": 1,
"id": 1,
"title": "delectus aut autem",
"completed": false
}
{
"userId": 1,
"id": 2,
"title": "quis ut nam facilis et officia qui",
"completed": false
}
If the last argument given is a hash, it is the opts hash, where each key is a method or accessor to be called, and its value is the value to be set.
The keys may include:
Note: If port is nil and opts[:use_ssl] is a truthy value, the value passed to new is Net::HTTP.https_default_port, not port.
Returns the IP address for the connection.
If the session has not been started, returns the value set by ipaddr=, or nil if it has not been set:
http = Net::HTTP.new(hostname) http.ipaddr # => nil http.ipaddr = '172.67.155.76' http.ipaddr # => "172.67.155.76"
If the session has been started, returns the IP address from the socket:
http = Net::HTTP.new(hostname) http.start http.ipaddr # => "172.67.155.76" http.finish
Sets the IP address for the connection:
http = Net::HTTP.new(hostname) http.ipaddr # => nil http.ipaddr = '172.67.155.76' http.ipaddr # => "172.67.155.76"
The IP address may not be set if the session has been started.
Returns true if the HTTP session has been started:
http = Net::HTTP.new(hostname) http.started? # => false http.start http.started? # => true http.finish # => nil http.started? # => false Net::HTTP.start(hostname) do |http| http.started? end # => true http.started? # => false
Starts an HTTP session.
Without a block, returns self:
http = Net::HTTP.new(hostname) # => #<Net::HTTP jsonplaceholder.typicode.com:80 open=false> http.start # => #<Net::HTTP jsonplaceholder.typicode.com:80 open=true> http.started? # => true http.finish
With a block, calls the block with self, finishes the session when the block exits, and returns the block’s value:
http.start do |http| http end # => #<Net::HTTP jsonplaceholder.typicode.com:80 open=false> http.started? # => false
Sends a POST request to the server; returns an instance of a subclass of Net::HTTPResponse.
The request is based on the Net::HTTP::Post object created from string path, string data, and initial headers hash initheader.
With a block given, calls the block with the response body:
data = '{"userId": 1, "id": 1, "title": "delectus aut autem", "completed": false}' http = Net::HTTP.new(hostname) http.post('/todos', data) do |res| p res end # => #<Net::HTTPCreated 201 Created readbody=true>
Output:
"{\n \"{\\\"userId\\\": 1, \\\"id\\\": 1, \\\"title\\\": \\\"delectus aut autem\\\", \\\"completed\\\": false}\": \"\",\n \"id\": 201\n}"
With no block given, simply returns the response object:
http.post('/todos', data) # => #<Net::HTTPCreated 201 Created readbody=true>
Related:
Net::HTTP::Post: request class for HTTP method POST.
Net::HTTP.post: sends POST request, returns response body.
Sends a TRACE request to the server; returns an instance of a subclass of Net::HTTPResponse.
The request is based on the Net::HTTP::Trace object created from string path and initial headers hash initheader.
http = Net::HTTP.new(hostname) http.trace('/todos/1')
Sends the given request req to the server; forms the response into a Net::HTTPResponse object.
The given req must be an instance of a subclass of Net::HTTPRequest. Argument body should be given only if needed for the request.
With no block given, returns the response object:
http = Net::HTTP.new(hostname) req = Net::HTTP::Get.new('/todos/1') http.request(req) # => #<Net::HTTPOK 200 OK readbody=true> req = Net::HTTP::Post.new('/todos') http.request(req, 'xyzzy') # => #<Net::HTTPCreated 201 Created readbody=true>
With a block given, calls the block with the response and returns the response:
req = Net::HTTP::Get.new('/todos/1') http.request(req) do |res| p res end # => #<Net::HTTPOK 200 OK readbody=true>
Output:
#<Net::HTTPOK 200 OK readbody=false>
Returns the authority for an HTTP uri, as defined in www.rfc-editor.org/rfc/rfc3986#section-3.2.
Example:
URI::HTTP.build(host: 'www.example.com', path: '/foo/bar').authority #=> "www.example.com" URI::HTTP.build(host: 'www.example.com', port: 8000, path: '/foo/bar').authority #=> "www.example.com:8000" URI::HTTP.build(host: 'www.example.com', port: 80, path: '/foo/bar').authority #=> "www.example.com"
Returns the origin for an HTTP uri, as defined in www.rfc-editor.org/rfc/rfc6454.
Example:
URI::HTTP.build(host: 'www.example.com', path: '/foo/bar').origin #=> "http://www.example.com" URI::HTTP.build(host: 'www.example.com', port: 8000, path: '/foo/bar').origin #=> "http://www.example.com:8000" URI::HTTP.build(host: 'www.example.com', port: 80, path: '/foo/bar').origin #=> "http://www.example.com" URI::HTTPS.build(host: 'www.example.com', path: '/foo/bar').origin #=> "https://www.example.com"
This is used as a predicate, and ought to be called first.