The Google Maps Platform static web APIs are a collection of HTTP interfaces to Google services that generate images that you can embed directly on your web page.
This guide describes some common practices useful for setting up your image requests and processing service responses. Refer to the developer’s guide for full documentation of the Maps Static API.
A typical Maps Static API request is generally of the following form:
Note: All Maps Static API applications require authentication. Get more information on authentication credentials.
HTTPS is required for all Google Maps Platform requests that use API keys or contain user data. Requests made over HTTP that contain sensitive data may be rejected.
Building a valid URL
You may think that a "valid" URL is self-evident, but
that's not quite the case. A URL entered within an address bar in a
browser, for example, may contain special characters (e.g.
"上海+中國"); the browser needs to internally translate
those characters into a different encoding before transmission.
By the same token, any code that generates or accepts UTF-8 input
might treat URLs with UTF-8 characters as "valid", but would also need
to translate those characters before sending them out to a web server.
This process is called
URL-encoding or percent-encoding.
We need to translate special characters because all URLs need to conform to the syntax specified by the Uniform Resource Identifier (URI) specification. In effect, this means that URLs must contain only a special subset of ASCII characters: the familiar alphanumeric symbols, and some reserved characters for use as control characters within URLs. This table summarizes these characters:
|Alphanumeric||a b c d e f g h i j k l m n o p q r s t u v w x y z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0 1 2 3 4 5 6 7 8 9||Text strings, scheme usage (
|Unreserved||- _ . ~||Text strings|
|Reserved||! * ' ( ) ; : @ & = + $ , / ? % # [ ]||Control characters and/or Text Strings|
When building a valid URL, you must ensure that it contains only those characters shown in the Summary of Valid URL Characters table. Conforming a URL to use this set of characters generally leads to two issues, one of omission and one of substitution:
- Characters that you wish to handle exist outside of the
above set. For example, characters in foreign languages
上海+中國need to be encoded using the above characters. By popular convention, spaces (which are not allowed within URLs) are often represented using the plus
'+'character as well.
- Characters exist within the above set as reserved characters,
but need to be used literally.
?is used within URLs to indicate the beginning of the query string; if you wish to use the string "? and the Mysterions," you'd need to encode the
All characters to be URL-encoded are encoded
'%' character and a two-character hex
value corresponding to their UTF-8 character. For example,
上海+中國 in UTF-8 would be URL-encoded as
? and the Mysterians would be URL-encoded as
Common characters that need encoding
Some common characters that must be encoded are:
|Unsafe character||Encoded value|
Converting a URL that you receive from user input is sometimes tricky. For example, a user may enter an address as "5th&Main St." Generally, you should construct your URL from its parts, treating any user input as literal characters.
Additionally, URLs are limited to 16384 characters for all Google Maps Platform web services and static web APIs. For most services, this character limit will seldom be approached. However, note that certain services have several parameters that may result in long URLs.