exporter: use liberal parsing of headers environment variables

Author: xrmx

Diff for: exporter/opentelemetry-exporter-otlp-proto-grpc/src/opentelemetry/exporter/otlp/proto/grpc/exporter.py

@@ -188,7 +188,7 @@ def __init__(
 
         self._headers = headers or environ.get(OTEL_EXPORTER_OTLP_HEADERS)
         if isinstance(self._headers, str):
-            temp_headers = parse_env_headers(self._headers)
+            temp_headers = parse_env_headers(self._headers, liberal=True)
             self._headers = tuple(temp_headers.items())
         elif isinstance(self._headers, dict):
             self._headers = tuple(self._headers.items())

Diff for: exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/_log_exporter/__init__.py

@@ -86,7 +86,9 @@ def __init__(
             OTEL_EXPORTER_OTLP_LOGS_HEADERS,
             environ.get(OTEL_EXPORTER_OTLP_HEADERS, ""),
         )
-        self._headers = headers or parse_env_headers(headers_string)
+        self._headers = headers or parse_env_headers(
+            headers_string, liberal=True
+        )
         self._timeout = timeout or int(
             environ.get(
                 OTEL_EXPORTER_OTLP_LOGS_TIMEOUT,

Diff for: exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/metric_exporter/__init__.py

@@ -117,7 +117,9 @@ def __init__(
             OTEL_EXPORTER_OTLP_METRICS_HEADERS,
             environ.get(OTEL_EXPORTER_OTLP_HEADERS, ""),
         )
-        self._headers = headers or parse_env_headers(headers_string)
+        self._headers = headers or parse_env_headers(
+            headers_string, liberal=True
+        )
         self._timeout = timeout or int(
             environ.get(
                 OTEL_EXPORTER_OTLP_METRICS_TIMEOUT,

Diff for: exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py

@@ -84,7 +84,9 @@ def __init__(
             OTEL_EXPORTER_OTLP_TRACES_HEADERS,
             environ.get(OTEL_EXPORTER_OTLP_HEADERS, ""),
         )
-        self._headers = headers or parse_env_headers(headers_string)
+        self._headers = headers or parse_env_headers(
+            headers_string, liberal=True
+        )
         self._timeout = timeout or int(
             environ.get(
                 OTEL_EXPORTER_OTLP_TRACES_TIMEOUT,