Binary Responses

To return binary responses, such as PDF downloads, from your Vapor application, your HTTP response should include the X-Vapor-Base64-Encode header:

return $response->withHeaders([
    'X-Vapor-Base64-Encode' => 'True',

Lambda Response Size

Lambda limits responses to 6MB. If you need to serve a larger file, consider returning a signed, temporary S3 URL that your user may use to download the file directly from S3.

Configuring OpenSSL

To use certain OpenSSL functions such as openssl_pkey_new, you must create an openssl.cnf configuration file and instruct Vapor to load it via the OPENSSL_CONF environment variable. For example, this environment variable will instruct Vapor to load an openssl.cnf file from the root of your project:


An example openssl.cnf file is available below:

dir = certificates

[ ca ]
default_ca = CA_default

[ CA_default ]
serial = $dir/serial
database = $dir/index.txt
new_certs_dir = $dir/newcerts
certificate  = $dir/cacert.pem
private_key = $dir/private/cakey.pem
default_days = 36500
default_md  = sha256
preserve = no
email_in_dn  = no
nameopt = default_ca
certopt = default_ca
policy = policy_match

[ policy_match ]
commonName = supplied
countryName = optional
stateOrProvinceName = optional
organizationName = optional
organizationalUnitName = optional
emailAddress = optional

[ req ]
default_bits = 2048
default_keyfile = priv.pem
default_md = sha256
distinguished_name = req_distinguished_name
req_extensions = v3_req
encyrpt_key = no

[ req_distinguished_name ]

[ v3_ca ]
basicConstraints = CA:TRUE
subjectKeyIdentifier = hash
authorityKeyIdentifier = keyid:always,issuer:always

[ v3_req ]
basicConstraints = CA:FALSE
subjectKeyIdentifier = hash

"After Response" Jobs

In typical Laravel applications, you may dispatch jobs that will be executed after the HTTP response is sent to the browser:

Route::get('/', function () { dispatch(function () { Mail::to('[email protected]')->send(new WelcomeMessage); })->afterResponse();

return view('home');


However, we recommend that you always dispatch jobs to your queue workers when using Vapor. Vapor is not able to execute a job after sending a response to the browser; therefore, attempting to do so will cause your application to appear slower to the end user.